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Simplifying 5x + 7(1 + -1x) = 15 5x + (1 * 7 + -1x * 7) = 15 5x + (7 + -7x) = 15 Reorder the terms: 7 + 5x + -7x = 15 Combine like terms: 5x + -7x = -2x 7 + -2x = 15 Solving 7 + -2x = 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 + -2x = 15 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 15 + -7 -2x = 15 + -7 Combine like terms: 15 + -7 = 8 -2x = 8 Divide each side by '-2'. x = -4 Simplifying x = -4
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