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Simplifying 9 + -1(-11a) + -7a = -7 Remove parenthesis around (-11a) 9 + -1 * -11a + -7a = -7 Multiply -1 * -11 9 + 11a + -7a = -7 Combine like terms: 11a + -7a = 4a 9 + 4a = -7 Solving 9 + 4a = -7 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 = -7 + -9 Combine like terms: 9 + -9 = 0 0 + 4a = -7 + -9 4a = -7 + -9 Combine like terms: -7 + -9 = -16 4a = -16 Divide each side by '4'. a = -4 Simplifying a = -4
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