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Simplifying 91 = -7(3a + -1) Reorder the terms: 91 = -7(-1 + 3a) 91 = (-1 * -7 + 3a * -7) 91 = (7 + -21a) Solving 91 = 7 + -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. 91 + 21a = 7 + -21a + 21a Combine like terms: -21a + 21a = 0 91 + 21a = 7 + 0 91 + 21a = 7 Add '-91' to each side of the equation. 91 + -91 + 21a = 7 + -91 Combine like terms: 91 + -91 = 0 0 + 21a = 7 + -91 21a = 7 + -91 Combine like terms: 7 + -91 = -84 21a = -84 Divide each side by '21'. a = -4 Simplifying a = -4
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