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Simplifying 0.21x + 0.09(3000 + -1x) = 630 0.21x + (3000 * 0.09 + -1x * 0.09) = 630 0.21x + (270 + -0.09x) = 630 Reorder the terms: 270 + 0.21x + -0.09x = 630 Combine like terms: 0.21x + -0.09x = 0.12x 270 + 0.12x = 630 Solving 270 + 0.12x = 630 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-270' to each side of the equation. 270 + -270 + 0.12x = 630 + -270 Combine like terms: 270 + -270 = 0 0 + 0.12x = 630 + -270 0.12x = 630 + -270 Combine like terms: 630 + -270 = 360 0.12x = 360 Divide each side by '0.12'. x = 3000 Simplifying x = 3000
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