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Simplifying -7a + 7(5a + -5) = -231 Reorder the terms: -7a + 7(-5 + 5a) = -231 -7a + (-5 * 7 + 5a * 7) = -231 -7a + (-35 + 35a) = -231 Reorder the terms: -35 + -7a + 35a = -231 Combine like terms: -7a + 35a = 28a -35 + 28a = -231 Solving -35 + 28a = -231 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + 28a = -231 + 35 Combine like terms: -35 + 35 = 0 0 + 28a = -231 + 35 28a = -231 + 35 Combine like terms: -231 + 35 = -196 28a = -196 Divide each side by '28'. a = -7 Simplifying a = -7
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