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Simplifying x + -2x + 4 = 81 Reorder the terms: 4 + x + -2x = 81 Combine like terms: x + -2x = -1x 4 + -1x = 81 Solving 4 + -1x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -1x = 81 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 81 + -4 -1x = 81 + -4 Combine like terms: 81 + -4 = 77 -1x = 77 Divide each side by '-1'. x = -77 Simplifying x = -77
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