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Simplifying 138 + -7x = 20x + 15x Combine like terms: 20x + 15x = 35x 138 + -7x = 35x Solving 138 + -7x = 35x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35x' to each side of the equation. 138 + -7x + -35x = 35x + -35x Combine like terms: -7x + -35x = -42x 138 + -42x = 35x + -35x Combine like terms: 35x + -35x = 0 138 + -42x = 0 Add '-138' to each side of the equation. 138 + -138 + -42x = 0 + -138 Combine like terms: 138 + -138 = 0 0 + -42x = 0 + -138 -42x = 0 + -138 Combine like terms: 0 + -138 = -138 -42x = -138 Divide each side by '-42'. x = 3.285714286 Simplifying x = 3.285714286
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