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Simplifying -7 = 8 + -1(9 + -1a) -7 = 8 + (9 * -1 + -1a * -1) -7 = 8 + (-9 + 1a) Combine like terms: 8 + -9 = -1 -7 = -1 + 1a Solving -7 = -1 + 1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -7 + -1a = -1 + 1a + -1a Combine like terms: 1a + -1a = 0 -7 + -1a = -1 + 0 -7 + -1a = -1 Add '7' to each side of the equation. -7 + 7 + -1a = -1 + 7 Combine like terms: -7 + 7 = 0 0 + -1a = -1 + 7 -1a = -1 + 7 Combine like terms: -1 + 7 = 6 -1a = 6 Divide each side by '-1'. a = -6 Simplifying a = -6
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