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Simplifying 13 + -7x = 138 + -42x Solving 13 + -7x = 138 + -42x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '42x' to each side of the equation. 13 + -7x + 42x = 138 + -42x + 42x Combine like terms: -7x + 42x = 35x 13 + 35x = 138 + -42x + 42x Combine like terms: -42x + 42x = 0 13 + 35x = 138 + 0 13 + 35x = 138 Add '-13' to each side of the equation. 13 + -13 + 35x = 138 + -13 Combine like terms: 13 + -13 = 0 0 + 35x = 138 + -13 35x = 138 + -13 Combine like terms: 138 + -13 = 125 35x = 125 Divide each side by '35'. x = 3.571428571 Simplifying x = 3.571428571
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