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Simplifying 12 = 3(a + -4) Reorder the terms: 12 = 3(-4 + a) 12 = (-4 * 3 + a * 3) 12 = (-12 + 3a) Solving 12 = -12 + 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. 12 + -3a = -12 + 3a + -3a Combine like terms: 3a + -3a = 0 12 + -3a = -12 + 0 12 + -3a = -12 Add '-12' to each side of the equation. 12 + -12 + -3a = -12 + -12 Combine like terms: 12 + -12 = 0 0 + -3a = -12 + -12 -3a = -12 + -12 Combine like terms: -12 + -12 = -24 -3a = -24 Divide each side by '-3'. a = 8 Simplifying a = 8
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