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Simplifying 2 + -5(a + -1) = 9 + a Reorder the terms: 2 + -5(-1 + a) = 9 + a 2 + (-1 * -5 + a * -5) = 9 + a 2 + (5 + -5a) = 9 + a Combine like terms: 2 + 5 = 7 7 + -5a = 9 + a Solving 7 + -5a = 9 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 7 + -5a + -1a = 9 + a + -1a Combine like terms: -5a + -1a = -6a 7 + -6a = 9 + a + -1a Combine like terms: a + -1a = 0 7 + -6a = 9 + 0 7 + -6a = 9 Add '-7' to each side of the equation. 7 + -7 + -6a = 9 + -7 Combine like terms: 7 + -7 = 0 0 + -6a = 9 + -7 -6a = 9 + -7 Combine like terms: 9 + -7 = 2 -6a = 2 Divide each side by '-6'. a = -0.3333333333 Simplifying a = -0.3333333333
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