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Simplifying x + -20 + x + -20 + 90 = 180 Reorder the terms: -20 + -20 + 90 + x + x = 180 Combine like terms: -20 + -20 = -40 -40 + 90 + x + x = 180 Combine like terms: -40 + 90 = 50 50 + x + x = 180 Combine like terms: x + x = 2x 50 + 2x = 180 Solving 50 + 2x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + 2x = 180 + -50 Combine like terms: 50 + -50 = 0 0 + 2x = 180 + -50 2x = 180 + -50 Combine like terms: 180 + -50 = 130 2x = 130 Divide each side by '2'. x = 65 Simplifying x = 65
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