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Simplifying 20x + -1(7x + -9) = 61 Reorder the terms: 20x + -1(-9 + 7x) = 61 20x + (-9 * -1 + 7x * -1) = 61 20x + (9 + -7x) = 61 Reorder the terms: 9 + 20x + -7x = 61 Combine like terms: 20x + -7x = 13x 9 + 13x = 61 Solving 9 + 13x = 61 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 13x = 61 + -9 Combine like terms: 9 + -9 = 0 0 + 13x = 61 + -9 13x = 61 + -9 Combine like terms: 61 + -9 = 52 13x = 52 Divide each side by '13'. x = 4 Simplifying x = 4
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