$\"\"$

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The equation is $\"\"$ .

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To find the LCD of left side denominators.

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First denominator $\"\"$ : $\"\"$ .

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Second denominator $\"\"$ : $\"\"$ .

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Then LCD is $\"\"$ .

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So rewrite $\"\"$ . $\"\"$

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$\"\"$

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Left side denominators are same and subtract numerators.

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$\"\"$

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$\"\"$

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Apply cross product property: $\"\"$ .

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$\"\"$

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$\"\"$ $\"\"$

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Apply distributive property: $\"\"$ .

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$\"\"$

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Subtract 30a from each side.

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$\"\"$

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$\"\"$

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Divide each side by negative 20.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ \ \

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The value of

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\"\"

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.