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Simplifying 9 + -2(a + -1) = 2 + a Reorder the terms: 9 + -2(-1 + a) = 2 + a 9 + (-1 * -2 + a * -2) = 2 + a 9 + (2 + -2a) = 2 + a Combine like terms: 9 + 2 = 11 11 + -2a = 2 + a Solving 11 + -2a = 2 + 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. 11 + -2a + -1a = 2 + a + -1a Combine like terms: -2a + -1a = -3a 11 + -3a = 2 + a + -1a Combine like terms: a + -1a = 0 11 + -3a = 2 + 0 11 + -3a = 2 Add '-11' to each side of the equation. 11 + -11 + -3a = 2 + -11 Combine like terms: 11 + -11 = 0 0 + -3a = 2 + -11 -3a = 2 + -11 Combine like terms: 2 + -11 = -9 -3a = -9 Divide each side by '-3'. a = 3 Simplifying a = 3
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