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Simplifying -1(a + -9) = 2a + 30 Reorder the terms: -1(-9 + a) = 2a + 30 (-9 * -1 + a * -1) = 2a + 30 (9 + -1a) = 2a + 30 Reorder the terms: 9 + -1a = 30 + 2a Solving 9 + -1a = 30 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 9 + -1a + -2a = 30 + 2a + -2a Combine like terms: -1a + -2a = -3a 9 + -3a = 30 + 2a + -2a Combine like terms: 2a + -2a = 0 9 + -3a = 30 + 0 9 + -3a = 30 Add '-9' to each side of the equation. 9 + -9 + -3a = 30 + -9 Combine like terms: 9 + -9 = 0 0 + -3a = 30 + -9 -3a = 30 + -9 Combine like terms: 30 + -9 = 21 -3a = 21 Divide each side by '-3'. a = -7 Simplifying a = -7
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