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Simplifying 81 = 4x + 3(2x + -13) Reorder the terms: 81 = 4x + 3(-13 + 2x) 81 = 4x + (-13 * 3 + 2x * 3) 81 = 4x + (-39 + 6x) Reorder the terms: 81 = -39 + 4x + 6x Combine like terms: 4x + 6x = 10x 81 = -39 + 10x Solving 81 = -39 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 81 + -10x = -39 + 10x + -10x Combine like terms: 10x + -10x = 0 81 + -10x = -39 + 0 81 + -10x = -39 Add '-81' to each side of the equation. 81 + -81 + -10x = -39 + -81 Combine like terms: 81 + -81 = 0 0 + -10x = -39 + -81 -10x = -39 + -81 Combine like terms: -39 + -81 = -120 -10x = -120 Divide each side by '-10'. x = 12 Simplifying x = 12
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