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Simplifying 10x + 30(x + -4) = 280 Reorder the terms: 10x + 30(-4 + x) = 280 10x + (-4 * 30 + x * 30) = 280 10x + (-120 + 30x) = 280 Reorder the terms: -120 + 10x + 30x = 280 Combine like terms: 10x + 30x = 40x -120 + 40x = 280 Solving -120 + 40x = 280 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '120' to each side of the equation. -120 + 120 + 40x = 280 + 120 Combine like terms: -120 + 120 = 0 0 + 40x = 280 + 120 40x = 280 + 120 Combine like terms: 280 + 120 = 400 40x = 400 Divide each side by '40'. x = 10 Simplifying x = 10
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