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Simplifying 10x + 20(x + -3) = 390 Reorder the terms: 10x + 20(-3 + x) = 390 10x + (-3 * 20 + x * 20) = 390 10x + (-60 + 20x) = 390 Reorder the terms: -60 + 10x + 20x = 390 Combine like terms: 10x + 20x = 30x -60 + 30x = 390 Solving -60 + 30x = 390 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '60' to each side of the equation. -60 + 60 + 30x = 390 + 60 Combine like terms: -60 + 60 = 0 0 + 30x = 390 + 60 30x = 390 + 60 Combine like terms: 390 + 60 = 450 30x = 450 Divide each side by '30'. x = 15 Simplifying x = 15
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