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Simplifying -1 + -4(-5a + 2) = -129 Reorder the terms: -1 + -4(2 + -5a) = -129 -1 + (2 * -4 + -5a * -4) = -129 -1 + (-8 + 20a) = -129 Combine like terms: -1 + -8 = -9 -9 + 20a = -129 Solving -9 + 20a = -129 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 20a = -129 + 9 Combine like terms: -9 + 9 = 0 0 + 20a = -129 + 9 20a = -129 + 9 Combine like terms: -129 + 9 = -120 20a = -120 Divide each side by '20'. a = -6 Simplifying a = -6
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