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Simplifying 7(-4a + 1) = 91 Reorder the terms: 7(1 + -4a) = 91 (1 * 7 + -4a * 7) = 91 (7 + -28a) = 91 Solving 7 + -28a = 91 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 + -28a = 91 + -7 Combine like terms: 7 + -7 = 0 0 + -28a = 91 + -7 -28a = 91 + -7 Combine like terms: 91 + -7 = 84 -28a = 84 Divide each side by '-28'. a = -3 Simplifying a = -3
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