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Simplifying 7(a + -1) + 5a = 89 Reorder the terms: 7(-1 + a) + 5a = 89 (-1 * 7 + a * 7) + 5a = 89 (-7 + 7a) + 5a = 89 Combine like terms: 7a + 5a = 12a -7 + 12a = 89 Solving -7 + 12a = 89 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 + 12a = 89 + 7 Combine like terms: -7 + 7 = 0 0 + 12a = 89 + 7 12a = 89 + 7 Combine like terms: 89 + 7 = 96 12a = 96 Divide each side by '12'. a = 8 Simplifying a = 8
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