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Simplifying 3x + -4x + 7 = 15 Reorder the terms: 7 + 3x + -4x = 15 Combine like terms: 3x + -4x = -1x 7 + -1x = 15 Solving 7 + -1x = 15 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 + -1x = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -1x = 15 + -7 -1x = 15 + -7 Combine like terms: 15 + -7 = 8 -1x = 8 Divide each side by '-1'. x = -8 Simplifying x = -8
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