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Simplifying 3x + -7 + -8x = 138 Reorder the terms: -7 + 3x + -8x = 138 Combine like terms: 3x + -8x = -5x -7 + -5x = 138 Solving -7 + -5x = 138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -5x = 138 + 7 Combine like terms: -7 + 7 = 0 0 + -5x = 138 + 7 -5x = 138 + 7 Combine like terms: 138 + 7 = 145 -5x = 145 Divide each side by '-5'. x = -29 Simplifying x = -29
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