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Simplifying 10x + 7(300 + -1x) = 2640 10x + (300 * 7 + -1x * 7) = 2640 10x + (2100 + -7x) = 2640 Reorder the terms: 2100 + 10x + -7x = 2640 Combine like terms: 10x + -7x = 3x 2100 + 3x = 2640 Solving 2100 + 3x = 2640 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2100' to each side of the equation. 2100 + -2100 + 3x = 2640 + -2100 Combine like terms: 2100 + -2100 = 0 0 + 3x = 2640 + -2100 3x = 2640 + -2100 Combine like terms: 2640 + -2100 = 540 3x = 540 Divide each side by '3'. x = 180 Simplifying x = 180
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