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Simplifying a + -2(a + -15) = 9a Reorder the terms: a + -2(-15 + a) = 9a a + (-15 * -2 + a * -2) = 9a a + (30 + -2a) = 9a Reorder the terms: 30 + a + -2a = 9a Combine like terms: a + -2a = -1a 30 + -1a = 9a Solving 30 + -1a = 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 30 + -1a + -9a = 9a + -9a Combine like terms: -1a + -9a = -10a 30 + -10a = 9a + -9a Combine like terms: 9a + -9a = 0 30 + -10a = 0 Add '-30' to each side of the equation. 30 + -30 + -10a = 0 + -30 Combine like terms: 30 + -30 = 0 0 + -10a = 0 + -30 -10a = 0 + -30 Combine like terms: 0 + -30 = -30 -10a = -30 Divide each side by '-10'. a = 3 Simplifying a = 3
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