When solving the equation 4 (3x^2 + 2) - 9 = 8x^2 + 7, Emily wrote
4 (3x^2 + 2) = 8x^2 + 16 as her first step. Which property justifies
Emily's first step?
(1) addition property of equality
(2) commutative property of addition
(3) multiplication property of equality
(4) distributive property of multiplication over addition
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