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Simplifying 3 + -3(a + 2) = 9 + 9 Reorder the terms: 3 + -3(2 + a) = 9 + 9 3 + (2 * -3 + a * -3) = 9 + 9 3 + (-6 + -3a) = 9 + 9 Combine like terms: 3 + -6 = -3 -3 + -3a = 9 + 9 Combine like terms: 9 + 9 = 18 -3 + -3a = 18 Solving -3 + -3a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -3a = 18 + 3 Combine like terms: -3 + 3 = 0 0 + -3a = 18 + 3 -3a = 18 + 3 Combine like terms: 18 + 3 = 21 -3a = 21 Divide each side by '-3'. a = -7 Simplifying a = -7
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