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Simplifying 129 = -3(-7a + -8) Reorder the terms: 129 = -3(-8 + -7a) 129 = (-8 * -3 + -7a * -3) 129 = (24 + 21a) Solving 129 = 24 + 21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21a' to each side of the equation. 129 + -21a = 24 + 21a + -21a Combine like terms: 21a + -21a = 0 129 + -21a = 24 + 0 129 + -21a = 24 Add '-129' to each side of the equation. 129 + -129 + -21a = 24 + -129 Combine like terms: 129 + -129 = 0 0 + -21a = 24 + -129 -21a = 24 + -129 Combine like terms: 24 + -129 = -105 -21a = -105 Divide each side by '-21'. a = 5 Simplifying a = 5
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