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Simplifying 138 = 7 + x + 2x Combine like terms: x + 2x = 3x 138 = 7 + 3x Solving 138 = 7 + 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. 138 + -3x = 7 + 3x + -3x Combine like terms: 3x + -3x = 0 138 + -3x = 7 + 0 138 + -3x = 7 Add '-138' to each side of the equation. 138 + -138 + -3x = 7 + -138 Combine like terms: 138 + -138 = 0 0 + -3x = 7 + -138 -3x = 7 + -138 Combine like terms: 7 + -138 = -131 -3x = -131 Divide each side by '-3'. x = 43.66666667 Simplifying x = 43.66666667
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