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Simplifying 4(10x + 100) = 640 Reorder the terms: 4(100 + 10x) = 640 (100 * 4 + 10x * 4) = 640 (400 + 40x) = 640 Solving 400 + 40x = 640 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-400' to each side of the equation. 400 + -400 + 40x = 640 + -400 Combine like terms: 400 + -400 = 0 0 + 40x = 640 + -400 40x = 640 + -400 Combine like terms: 640 + -400 = 240 40x = 240 Divide each side by '40'. x = 6 Simplifying x = 6
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