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Simplifying 129 = 5(2a + -1) + 2a Reorder the terms: 129 = 5(-1 + 2a) + 2a 129 = (-1 * 5 + 2a * 5) + 2a 129 = (-5 + 10a) + 2a Combine like terms: 10a + 2a = 12a 129 = -5 + 12a Solving 129 = -5 + 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. 129 + -12a = -5 + 12a + -12a Combine like terms: 12a + -12a = 0 129 + -12a = -5 + 0 129 + -12a = -5 Add '-129' to each side of the equation. 129 + -129 + -12a = -5 + -129 Combine like terms: 129 + -129 = 0 0 + -12a = -5 + -129 -12a = -5 + -129 Combine like terms: -5 + -129 = -134 -12a = -134 Divide each side by '-12'. a = 11.16666667 Simplifying a = 11.16666667
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