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Simplifying x + (x + 40) + (x + 40 + 220) = 1440 Reorder the terms: x + (40 + x) + (x + 40 + 220) = 1440 Remove parenthesis around (40 + x) x + 40 + x + (x + 40 + 220) = 1440 Reorder the terms: x + 40 + x + (40 + 220 + x) = 1440 Combine like terms: 40 + 220 = 260 x + 40 + x + (260 + x) = 1440 Remove parenthesis around (260 + x) x + 40 + x + 260 + x = 1440 Reorder the terms: 40 + 260 + x + x + x = 1440 Combine like terms: 40 + 260 = 300 300 + x + x + x = 1440 Combine like terms: x + x = 2x 300 + 2x + x = 1440 Combine like terms: 2x + x = 3x 300 + 3x = 1440 Solving 300 + 3x = 1440 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-300' to each side of the equation. 300 + -300 + 3x = 1440 + -300 Combine like terms: 300 + -300 = 0 0 + 3x = 1440 + -300 3x = 1440 + -300 Combine like terms: 1440 + -300 = 1140 3x = 1140 Divide each side by '3'. x = 380 Simplifying x = 380
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