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Simplifying 131 = -4(7a + 3) + 3 Reorder the terms: 131 = -4(3 + 7a) + 3 131 = (3 * -4 + 7a * -4) + 3 131 = (-12 + -28a) + 3 Reorder the terms: 131 = -12 + 3 + -28a Combine like terms: -12 + 3 = -9 131 = -9 + -28a Solving 131 = -9 + -28a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '28a' to each side of the equation. 131 + 28a = -9 + -28a + 28a Combine like terms: -28a + 28a = 0 131 + 28a = -9 + 0 131 + 28a = -9 Add '-131' to each side of the equation. 131 + -131 + 28a = -9 + -131 Combine like terms: 131 + -131 = 0 0 + 28a = -9 + -131 28a = -9 + -131 Combine like terms: -9 + -131 = -140 28a = -140 Divide each side by '28'. a = -5 Simplifying a = -5
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