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Simplifying 20x + -1(8x + -7) = 91 Reorder the terms: 20x + -1(-7 + 8x) = 91 20x + (-7 * -1 + 8x * -1) = 91 20x + (7 + -8x) = 91 Reorder the terms: 7 + 20x + -8x = 91 Combine like terms: 20x + -8x = 12x 7 + 12x = 91 Solving 7 + 12x = 91 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 + 12x = 91 + -7 Combine like terms: 7 + -7 = 0 0 + 12x = 91 + -7 12x = 91 + -7 Combine like terms: 91 + -7 = 84 12x = 84 Divide each side by '12'. x = 7 Simplifying x = 7
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