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Simplifying 15 = 8 + 9(-1a) Remove parenthesis around (-1a) 15 = 8 + 9 * -1a Multiply 9 * -1 15 = 8 + -9a Solving 15 = 8 + -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. 15 + 9a = 8 + -9a + 9a Combine like terms: -9a + 9a = 0 15 + 9a = 8 + 0 15 + 9a = 8 Add '-15' to each side of the equation. 15 + -15 + 9a = 8 + -15 Combine like terms: 15 + -15 = 0 0 + 9a = 8 + -15 9a = 8 + -15 Combine like terms: 8 + -15 = -7 9a = -7 Divide each side by '9'. a = -0.7777777778 Simplifying a = -0.7777777778
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