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Simplifying 7(3a + 5) = -91 Reorder the terms: 7(5 + 3a) = -91 (5 * 7 + 3a * 7) = -91 (35 + 21a) = -91 Solving 35 + 21a = -91 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + 21a = -91 + -35 Combine like terms: 35 + -35 = 0 0 + 21a = -91 + -35 21a = -91 + -35 Combine like terms: -91 + -35 = -126 21a = -126 Divide each side by '21'. a = -6 Simplifying a = -6
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