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Simplifying -87 = -2(5 + 8a) + 5a -87 = (5 * -2 + 8a * -2) + 5a -87 = (-10 + -16a) + 5a Combine like terms: -16a + 5a = -11a -87 = -10 + -11a Solving -87 = -10 + -11a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '11a' to each side of the equation. -87 + 11a = -10 + -11a + 11a Combine like terms: -11a + 11a = 0 -87 + 11a = -10 + 0 -87 + 11a = -10 Add '87' to each side of the equation. -87 + 87 + 11a = -10 + 87 Combine like terms: -87 + 87 = 0 0 + 11a = -10 + 87 11a = -10 + 87 Combine like terms: -10 + 87 = 77 11a = 77 Divide each side by '11'. a = 7 Simplifying a = 7
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