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Simplifying a + -2(a + -1) = 7 + 8 Reorder the terms: a + -2(-1 + a) = 7 + 8 a + (-1 * -2 + a * -2) = 7 + 8 a + (2 + -2a) = 7 + 8 Reorder the terms: 2 + a + -2a = 7 + 8 Combine like terms: a + -2a = -1a 2 + -1a = 7 + 8 Combine like terms: 7 + 8 = 15 2 + -1a = 15 Solving 2 + -1a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1a = 15 + -2 Combine like terms: 2 + -2 = 0 0 + -1a = 15 + -2 -1a = 15 + -2 Combine like terms: 15 + -2 = 13 -1a = 13 Divide each side by '-1'. a = -13 Simplifying a = -13
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