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Simplifying x + (3x + -140) = 380 Reorder the terms: x + (-140 + 3x) = 380 Remove parenthesis around (-140 + 3x) x + -140 + 3x = 380 Reorder the terms: -140 + x + 3x = 380 Combine like terms: x + 3x = 4x -140 + 4x = 380 Solving -140 + 4x = 380 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '140' to each side of the equation. -140 + 140 + 4x = 380 + 140 Combine like terms: -140 + 140 = 0 0 + 4x = 380 + 140 4x = 380 + 140 Combine like terms: 380 + 140 = 520 4x = 520 Divide each side by '4'. x = 130 Simplifying x = 130
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