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Simplifying 99 = x + (x + -1) Reorder the terms: 99 = x + (-1 + x) Remove parenthesis around (-1 + x) 99 = x + -1 + x Reorder the terms: 99 = -1 + x + x Combine like terms: x + x = 2x 99 = -1 + 2x Solving 99 = -1 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 99 + -2x = -1 + 2x + -2x Combine like terms: 2x + -2x = 0 99 + -2x = -1 + 0 99 + -2x = -1 Add '-99' to each side of the equation. 99 + -99 + -2x = -1 + -99 Combine like terms: 99 + -99 = 0 0 + -2x = -1 + -99 -2x = -1 + -99 Combine like terms: -1 + -99 = -100 -2x = -100 Divide each side by '-2'. x = 50 Simplifying x = 50
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