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Simplifying 20x + -1(9x + -7) = 40 Reorder the terms: 20x + -1(-7 + 9x) = 40 20x + (-7 * -1 + 9x * -1) = 40 20x + (7 + -9x) = 40 Reorder the terms: 7 + 20x + -9x = 40 Combine like terms: 20x + -9x = 11x 7 + 11x = 40 Solving 7 + 11x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 11x = 40 + -7 Combine like terms: 7 + -7 = 0 0 + 11x = 40 + -7 11x = 40 + -7 Combine like terms: 40 + -7 = 33 11x = 33 Divide each side by '11'. x = 3 Simplifying x = 3
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