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Simplifying 5x + 39 = 15x + 81 Reorder the terms: 39 + 5x = 15x + 81 Reorder the terms: 39 + 5x = 81 + 15x Solving 39 + 5x = 81 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 39 + 5x + -15x = 81 + 15x + -15x Combine like terms: 5x + -15x = -10x 39 + -10x = 81 + 15x + -15x Combine like terms: 15x + -15x = 0 39 + -10x = 81 + 0 39 + -10x = 81 Add '-39' to each side of the equation. 39 + -39 + -10x = 81 + -39 Combine like terms: 39 + -39 = 0 0 + -10x = 81 + -39 -10x = 81 + -39 Combine like terms: 81 + -39 = 42 -10x = 42 Divide each side by '-10'. x = -4.2 Simplifying x = -4.2
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