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Simplifying 3.20x + 2.30(80 + -1x) = 220 3.20x + (80 * 2.30 + -1x * 2.30) = 220 3.20x + (184 + -2.3x) = 220 Reorder the terms: 184 + 3.20x + -2.3x = 220 Combine like terms: 3.20x + -2.3x = 0.9x 184 + 0.9x = 220 Solving 184 + 0.9x = 220 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-184' to each side of the equation. 184 + -184 + 0.9x = 220 + -184 Combine like terms: 184 + -184 = 0 0 + 0.9x = 220 + -184 0.9x = 220 + -184 Combine like terms: 220 + -184 = 36 0.9x = 36 Divide each side by '0.9'. x = 40 Simplifying x = 40
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