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Simplifying 13x + 18 = 3x + 138 Reorder the terms: 18 + 13x = 3x + 138 Reorder the terms: 18 + 13x = 138 + 3x Solving 18 + 13x = 138 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 18 + 13x + -3x = 138 + 3x + -3x Combine like terms: 13x + -3x = 10x 18 + 10x = 138 + 3x + -3x Combine like terms: 3x + -3x = 0 18 + 10x = 138 + 0 18 + 10x = 138 Add '-18' to each side of the equation. 18 + -18 + 10x = 138 + -18 Combine like terms: 18 + -18 = 0 0 + 10x = 138 + -18 10x = 138 + -18 Combine like terms: 138 + -18 = 120 10x = 120 Divide each side by '10'. x = 12 Simplifying x = 12
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