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Simplifying 9 + -1(-11a) + -7a = -1 Remove parenthesis around (-11a) 9 + -1 * -11a + -7a = -1 Multiply -1 * -11 9 + 11a + -7a = -1 Combine like terms: 11a + -7a = 4a 9 + 4a = -1 Solving 9 + 4a = -1 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 + 4a = -1 + -9 Combine like terms: 9 + -9 = 0 0 + 4a = -1 + -9 4a = -1 + -9 Combine like terms: -1 + -9 = -10 4a = -10 Divide each side by '4'. a = -2.5 Simplifying a = -2.5
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