$\"\"$

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The expression is $\"\"$ .

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$\"\"$ (Apply commutative property of addition: a + b = b + a)

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$\"\"$ (Apply distributive property: $\"\"$ )

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$\"\"$ (Add: 2 + 1 = 3) $\"\"$ $\"\"$ (Apply distributive property: $\"\"$ )

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Zero product property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ ) $\"\"$

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The terms are 5c, $\"\"$ 2d, 3d, $\"\"$ d.

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The like terms are $\"\"$ .

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The coefficients are $\"\"$ .