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