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Simplifying -129 = -9(m + 9) + 3m Reorder the terms: -129 = -9(9 + m) + 3m -129 = (9 * -9 + m * -9) + 3m -129 = (-81 + -9m) + 3m Combine like terms: -9m + 3m = -6m -129 = -81 + -6m Solving -129 = -81 + -6m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '6m' to each side of the equation. -129 + 6m = -81 + -6m + 6m Combine like terms: -6m + 6m = 0 -129 + 6m = -81 + 0 -129 + 6m = -81 Add '129' to each side of the equation. -129 + 129 + 6m = -81 + 129 Combine like terms: -129 + 129 = 0 0 + 6m = -81 + 129 6m = -81 + 129 Combine like terms: -81 + 129 = 48 6m = 48 Divide each side by '6'. m = 8 Simplifying m = 8
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