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Simplifying 139 = x + 2x + (x + 15) Reorder the terms: 139 = x + 2x + (15 + x) Remove parenthesis around (15 + x) 139 = x + 2x + 15 + x Reorder the terms: 139 = 15 + x + 2x + x Combine like terms: x + 2x = 3x 139 = 15 + 3x + x Combine like terms: 3x + x = 4x 139 = 15 + 4x Solving 139 = 15 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 139 + -4x = 15 + 4x + -4x Combine like terms: 4x + -4x = 0 139 + -4x = 15 + 0 139 + -4x = 15 Add '-139' to each side of the equation. 139 + -139 + -4x = 15 + -139 Combine like terms: 139 + -139 = 0 0 + -4x = 15 + -139 -4x = 15 + -139 Combine like terms: 15 + -139 = -124 -4x = -124 Divide each side by '-4'. x = 31 Simplifying x = 31
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