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Simplifying -7(3a) + 17 + 6a = 81 Remove parenthesis around (3a) -7 * 3a + 17 + 6a = 81 Multiply -7 * 3 -21a + 17 + 6a = 81 Reorder the terms: 17 + -21a + 6a = 81 Combine like terms: -21a + 6a = -15a 17 + -15a = 81 Solving 17 + -15a = 81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + -15a = 81 + -17 Combine like terms: 17 + -17 = 0 0 + -15a = 81 + -17 -15a = 81 + -17 Combine like terms: 81 + -17 = 64 -15a = 64 Divide each side by '-15'. a = -4.266666667 Simplifying a = -4.266666667
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