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Simplifying 87 = -4 + 7(7a + -8) Reorder the terms: 87 = -4 + 7(-8 + 7a) 87 = -4 + (-8 * 7 + 7a * 7) 87 = -4 + (-56 + 49a) Combine like terms: -4 + -56 = -60 87 = -60 + 49a Solving 87 = -60 + 49a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-49a' to each side of the equation. 87 + -49a = -60 + 49a + -49a Combine like terms: 49a + -49a = 0 87 + -49a = -60 + 0 87 + -49a = -60 Add '-87' to each side of the equation. 87 + -87 + -49a = -60 + -87 Combine like terms: 87 + -87 = 0 0 + -49a = -60 + -87 -49a = -60 + -87 Combine like terms: -60 + -87 = -147 -49a = -147 Divide each side by '-49'. a = 3 Simplifying a = 3
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