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Simplifying 12(a + -1) = 84 Reorder the terms: 12(-1 + a) = 84 (-1 * 12 + a * 12) = 84 (-12 + 12a) = 84 Solving -12 + 12a = 84 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 12a = 84 + 12 Combine like terms: -12 + 12 = 0 0 + 12a = 84 + 12 12a = 84 + 12 Combine like terms: 84 + 12 = 96 12a = 96 Divide each side by '12'. a = 8 Simplifying a = 8
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