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Simplifying 9 + -2(a + -3) = -9 Reorder the terms: 9 + -2(-3 + a) = -9 9 + (-3 * -2 + a * -2) = -9 9 + (6 + -2a) = -9 Combine like terms: 9 + 6 = 15 15 + -2a = -9 Solving 15 + -2a = -9 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 = -9 + -15 Combine like terms: 15 + -15 = 0 0 + -2a = -9 + -15 -2a = -9 + -15 Combine like terms: -9 + -15 = -24 -2a = -24 Divide each side by '-2'. a = 12 Simplifying a = 12
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