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Simplifying a + -9 + -2(a + -12) = 0 Reorder the terms: a + -9 + -2(-12 + a) = 0 a + -9 + (-12 * -2 + a * -2) = 0 a + -9 + (24 + -2a) = 0 Reorder the terms: -9 + 24 + a + -2a = 0 Combine like terms: -9 + 24 = 15 15 + a + -2a = 0 Combine like terms: a + -2a = -1a 15 + -1a = 0 Solving 15 + -1a = 0 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 + -1a = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -1a = 0 + -15 -1a = 0 + -15 Combine like terms: 0 + -15 = -15 -1a = -15 Divide each side by '-1'. a = 15 Simplifying a = 15
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