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Simplifying 9x + -1(x + -2) = x + 20 Reorder the terms: 9x + -1(-2 + x) = x + 20 9x + (-2 * -1 + x * -1) = x + 20 9x + (2 + -1x) = x + 20 Reorder the terms: 2 + 9x + -1x = x + 20 Combine like terms: 9x + -1x = 8x 2 + 8x = x + 20 Reorder the terms: 2 + 8x = 20 + x Solving 2 + 8x = 20 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 2 + 8x + -1x = 20 + x + -1x Combine like terms: 8x + -1x = 7x 2 + 7x = 20 + x + -1x Combine like terms: x + -1x = 0 2 + 7x = 20 + 0 2 + 7x = 20 Add '-2' to each side of the equation. 2 + -2 + 7x = 20 + -2 Combine like terms: 2 + -2 = 0 0 + 7x = 20 + -2 7x = 20 + -2 Combine like terms: 20 + -2 = 18 7x = 18 Divide each side by '7'. x = 2.571428571 Simplifying x = 2.571428571
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