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Simplifying x + 3x + 20 = 180 Reorder the terms: 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 = 160 4x = 160 Divide each side by '4'. x = 40 Simplifying x = 40
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