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Simplifying x + (x + 20) + (2x + -30) = 400 Reorder the terms: x + (20 + x) + (2x + -30) = 400 Remove parenthesis around (20 + x) x + 20 + x + (2x + -30) = 400 Reorder the terms: x + 20 + x + (-30 + 2x) = 400 Remove parenthesis around (-30 + 2x) x + 20 + x + -30 + 2x = 400 Reorder the terms: 20 + -30 + x + x + 2x = 400 Combine like terms: 20 + -30 = -10 -10 + x + x + 2x = 400 Combine like terms: x + x = 2x -10 + 2x + 2x = 400 Combine like terms: 2x + 2x = 4x -10 + 4x = 400 Solving -10 + 4x = 400 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + 4x = 400 + 10 Combine like terms: -10 + 10 = 0 0 + 4x = 400 + 10 4x = 400 + 10 Combine like terms: 400 + 10 = 410 4x = 410 Divide each side by '4'. x = 102.5 Simplifying x = 102.5
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