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Simplifying 1 + -1(2 + a) = 13 1 + (2 * -1 + a * -1) = 13 1 + (-2 + -1a) = 13 Combine like terms: 1 + -2 = -1 -1 + -1a = 13 Solving -1 + -1a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -1a = 13 + 1 Combine like terms: -1 + 1 = 0 0 + -1a = 13 + 1 -1a = 13 + 1 Combine like terms: 13 + 1 = 14 -1a = 14 Divide each side by '-1'. a = -14 Simplifying a = -14
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