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Simplifying 13 + -2(a + -1) = 12 + 9 Reorder the terms: 13 + -2(-1 + a) = 12 + 9 13 + (-1 * -2 + a * -2) = 12 + 9 13 + (2 + -2a) = 12 + 9 Combine like terms: 13 + 2 = 15 15 + -2a = 12 + 9 Combine like terms: 12 + 9 = 21 15 + -2a = 21 Solving 15 + -2a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -2a = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -2a = 21 + -15 -2a = 21 + -15 Combine like terms: 21 + -15 = 6 -2a = 6 Divide each side by '-2'. a = -3 Simplifying a = -3
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