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

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The equation is $\"\"$ .

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$\"\"$ (Commutative property: a + b = b + a)

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$\"\"$ (Distributive property: $\"\"$ )

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

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$\"\"$

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$\"\"$ (Distributive property: $\"\"$ )

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$\"\"$ (Additive inverse property: $\"\"$ )

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

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$\"\"$ (Additive identity property: $\"\"$ )

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$\"\"$

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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 $\"\"$ .