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Simplifying (x + -20) + (3x) = 180 Reorder the terms: (-20 + x) + (3x) = 180 Remove parenthesis around (-20 + x) -20 + x + (3x) = 180 Combine like terms: x + (3x) = 4x -20 + 4x = 180 Solving -20 + 4x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 4x = 180 + 20 Combine like terms: -20 + 20 = 0 0 + 4x = 180 + 20 4x = 180 + 20 Combine like terms: 180 + 20 = 200 4x = 200 Divide each side by '4'. x = 50 Simplifying x = 50
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