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Simplifying 11 + -2(a + -1) = 7 + a Reorder the terms: 11 + -2(-1 + a) = 7 + a 11 + (-1 * -2 + a * -2) = 7 + a 11 + (2 + -2a) = 7 + a Combine like terms: 11 + 2 = 13 13 + -2a = 7 + a Solving 13 + -2a = 7 + 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. 13 + -2a + -1a = 7 + a + -1a Combine like terms: -2a + -1a = -3a 13 + -3a = 7 + a + -1a Combine like terms: a + -1a = 0 13 + -3a = 7 + 0 13 + -3a = 7 Add '-13' to each side of the equation. 13 + -13 + -3a = 7 + -13 Combine like terms: 13 + -13 = 0 0 + -3a = 7 + -13 -3a = 7 + -13 Combine like terms: 7 + -13 = -6 -3a = -6 Divide each side by '-3'. a = 2 Simplifying a = 2
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