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Simplifying x + (x + -15) = 221 Reorder the terms: x + (-15 + x) = 221 Remove parenthesis around (-15 + x) x + -15 + x = 221 Reorder the terms: -15 + x + x = 221 Combine like terms: x + x = 2x -15 + 2x = 221 Solving -15 + 2x = 221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 2x = 221 + 15 Combine like terms: -15 + 15 = 0 0 + 2x = 221 + 15 2x = 221 + 15 Combine like terms: 221 + 15 = 236 2x = 236 Divide each side by '2'. x = 118 Simplifying x = 118
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