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Simplifying -18 = -3(a + 3) + 12 Reorder the terms: -18 = -3(3 + a) + 12 -18 = (3 * -3 + a * -3) + 12 -18 = (-9 + -3a) + 12 Reorder the terms: -18 = -9 + 12 + -3a Combine like terms: -9 + 12 = 3 -18 = 3 + -3a Solving -18 = 3 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -18 + 3a = 3 + -3a + 3a Combine like terms: -3a + 3a = 0 -18 + 3a = 3 + 0 -18 + 3a = 3 Add '18' to each side of the equation. -18 + 18 + 3a = 3 + 18 Combine like terms: -18 + 18 = 0 0 + 3a = 3 + 18 3a = 3 + 18 Combine like terms: 3 + 18 = 21 3a = 21 Divide each side by '3'. a = 7 Simplifying a = 7
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