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Simplifying -9(a + -12) + 20 = 20 Reorder the terms: -9(-12 + a) + 20 = 20 (-12 * -9 + a * -9) + 20 = 20 (108 + -9a) + 20 = 20 Reorder the terms: 108 + 20 + -9a = 20 Combine like terms: 108 + 20 = 128 128 + -9a = 20 Solving 128 + -9a = 20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-128' to each side of the equation. 128 + -128 + -9a = 20 + -128 Combine like terms: 128 + -128 = 0 0 + -9a = 20 + -128 -9a = 20 + -128 Combine like terms: 20 + -128 = -108 -9a = -108 Divide each side by '-9'. a = 12 Simplifying a = 12
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