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Simplifying 13 + -2(a + -1) = 6 + -1a Reorder the terms: 13 + -2(-1 + a) = 6 + -1a 13 + (-1 * -2 + a * -2) = 6 + -1a 13 + (2 + -2a) = 6 + -1a Combine like terms: 13 + 2 = 15 15 + -2a = 6 + -1a Solving 15 + -2a = 6 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 15 + -2a + a = 6 + -1a + a Combine like terms: -2a + a = -1a 15 + -1a = 6 + -1a + a Combine like terms: -1a + a = 0 15 + -1a = 6 + 0 15 + -1a = 6 Add '-15' to each side of the equation. 15 + -15 + -1a = 6 + -15 Combine like terms: 15 + -15 = 0 0 + -1a = 6 + -15 -1a = 6 + -15 Combine like terms: 6 + -15 = -9 -1a = -9 Divide each side by '-1'. a = 9 Simplifying a = 9
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