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Simplifying -91 = -4(-6 + 7a) + -3 -91 = (-6 * -4 + 7a * -4) + -3 -91 = (24 + -28a) + -3 Reorder the terms: -91 = 24 + -3 + -28a Combine like terms: 24 + -3 = 21 -91 = 21 + -28a Solving -91 = 21 + -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. -91 + 28a = 21 + -28a + 28a Combine like terms: -28a + 28a = 0 -91 + 28a = 21 + 0 -91 + 28a = 21 Add '91' to each side of the equation. -91 + 91 + 28a = 21 + 91 Combine like terms: -91 + 91 = 0 0 + 28a = 21 + 91 28a = 21 + 91 Combine like terms: 21 + 91 = 112 28a = 112 Divide each side by '28'. a = 4 Simplifying a = 4
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