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Simplifying 20x + 10(x + 7) = 400 Reorder the terms: 20x + 10(7 + x) = 400 20x + (7 * 10 + x * 10) = 400 20x + (70 + 10x) = 400 Reorder the terms: 70 + 20x + 10x = 400 Combine like terms: 20x + 10x = 30x 70 + 30x = 400 Solving 70 + 30x = 400 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-70' to each side of the equation. 70 + -70 + 30x = 400 + -70 Combine like terms: 70 + -70 = 0 0 + 30x = 400 + -70 30x = 400 + -70 Combine like terms: 400 + -70 = 330 30x = 330 Divide each side by '30'. x = 11 Simplifying x = 11
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