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Simplifying -7 + -8(-1a + 3) = -87 Reorder the terms: -7 + -8(3 + -1a) = -87 -7 + (3 * -8 + -1a * -8) = -87 -7 + (-24 + 8a) = -87 Combine like terms: -7 + -24 = -31 -31 + 8a = -87 Solving -31 + 8a = -87 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '31' to each side of the equation. -31 + 31 + 8a = -87 + 31 Combine like terms: -31 + 31 = 0 0 + 8a = -87 + 31 8a = -87 + 31 Combine like terms: -87 + 31 = -56 8a = -56 Divide each side by '8'. a = -7 Simplifying a = -7
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