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Simplifying 13 + -2(a + -1) + 7a = 0 Reorder the terms: 13 + -2(-1 + a) + 7a = 0 13 + (-1 * -2 + a * -2) + 7a = 0 13 + (2 + -2a) + 7a = 0 Combine like terms: 13 + 2 = 15 15 + -2a + 7a = 0 Combine like terms: -2a + 7a = 5a 15 + 5a = 0 Solving 15 + 5a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 5a = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 5a = 0 + -15 5a = 0 + -15 Combine like terms: 0 + -15 = -15 5a = -15 Divide each side by '5'. a = -3 Simplifying a = -3
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