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Simplifying x + (x + 30) + 2x + (x + -15) = 215 Reorder the terms: x + (30 + x) + 2x + (x + -15) = 215 Remove parenthesis around (30 + x) x + 30 + x + 2x + (x + -15) = 215 Reorder the terms: x + 30 + x + 2x + (-15 + x) = 215 Remove parenthesis around (-15 + x) x + 30 + x + 2x + -15 + x = 215 Reorder the terms: 30 + -15 + x + x + 2x + x = 215 Combine like terms: 30 + -15 = 15 15 + x + x + 2x + x = 215 Combine like terms: x + x = 2x 15 + 2x + 2x + x = 215 Combine like terms: 2x + 2x = 4x 15 + 4x + x = 215 Combine like terms: 4x + x = 5x 15 + 5x = 215 Solving 15 + 5x = 215 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 + 5x = 215 + -15 Combine like terms: 15 + -15 = 0 0 + 5x = 215 + -15 5x = 215 + -15 Combine like terms: 215 + -15 = 200 5x = 200 Divide each side by '5'. x = 40 Simplifying x = 40
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