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Simplifying -7(3a + -1) = 91 Reorder the terms: -7(-1 + 3a) = 91 (-1 * -7 + 3a * -7) = 91 (7 + -21a) = 91 Solving 7 + -21a = 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 + -21a = 91 + -7 Combine like terms: 7 + -7 = 0 0 + -21a = 91 + -7 -21a = 91 + -7 Combine like terms: 91 + -7 = 84 -21a = 84 Divide each side by '-21'. a = -4 Simplifying a = -4
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