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Simplifying -3(a + -12) = 39 Reorder the terms: -3(-12 + a) = 39 (-12 * -3 + a * -3) = 39 (36 + -3a) = 39 Solving 36 + -3a = 39 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + -3a = 39 + -36 Combine like terms: 36 + -36 = 0 0 + -3a = 39 + -36 -3a = 39 + -36 Combine like terms: 39 + -36 = 3 -3a = 3 Divide each side by '-3'. a = -1 Simplifying a = -1
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