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Simplifying 90 + 90 + x + x + (x + 20) + (x + 20) = 720 Reorder the terms: 90 + 90 + x + x + (20 + x) + (x + 20) = 720 Remove parenthesis around (20 + x) 90 + 90 + x + x + 20 + x + (x + 20) = 720 Reorder the terms: 90 + 90 + x + x + 20 + x + (20 + x) = 720 Remove parenthesis around (20 + x) 90 + 90 + x + x + 20 + x + 20 + x = 720 Reorder the terms: 90 + 90 + 20 + 20 + x + x + x + x = 720 Combine like terms: 90 + 90 = 180 180 + 20 + 20 + x + x + x + x = 720 Combine like terms: 180 + 20 = 200 200 + 20 + x + x + x + x = 720 Combine like terms: 200 + 20 = 220 220 + x + x + x + x = 720 Combine like terms: x + x = 2x 220 + 2x + x + x = 720 Combine like terms: 2x + x = 3x 220 + 3x + x = 720 Combine like terms: 3x + x = 4x 220 + 4x = 720 Solving 220 + 4x = 720 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-220' to each side of the equation. 220 + -220 + 4x = 720 + -220 Combine like terms: 220 + -220 = 0 0 + 4x = 720 + -220 4x = 720 + -220 Combine like terms: 720 + -220 = 500 4x = 500 Divide each side by '4'. x = 125 Simplifying x = 125
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