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Simplifying -4a + 7(1 + -5a) = 124 -4a + (1 * 7 + -5a * 7) = 124 -4a + (7 + -35a) = 124 Reorder the terms: 7 + -4a + -35a = 124 Combine like terms: -4a + -35a = -39a 7 + -39a = 124 Solving 7 + -39a = 124 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -39a = 124 + -7 Combine like terms: 7 + -7 = 0 0 + -39a = 124 + -7 -39a = 124 + -7 Combine like terms: 124 + -7 = 117 -39a = 117 Divide each side by '-39'. a = -3 Simplifying a = -3
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