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Simplifying 86 = -7(a + -2) + -2a Reorder the terms: 86 = -7(-2 + a) + -2a 86 = (-2 * -7 + a * -7) + -2a 86 = (14 + -7a) + -2a Combine like terms: -7a + -2a = -9a 86 = 14 + -9a Solving 86 = 14 + -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. 86 + 9a = 14 + -9a + 9a Combine like terms: -9a + 9a = 0 86 + 9a = 14 + 0 86 + 9a = 14 Add '-86' to each side of the equation. 86 + -86 + 9a = 14 + -86 Combine like terms: 86 + -86 = 0 0 + 9a = 14 + -86 9a = 14 + -86 Combine like terms: 14 + -86 = -72 9a = -72 Divide each side by '9'. a = -8 Simplifying a = -8
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