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Simplifying 20 + -1(8 + x) + -1(x + -1) = 39 20 + (8 * -1 + x * -1) + -1(x + -1) = 39 20 + (-8 + -1x) + -1(x + -1) = 39 Reorder the terms: 20 + -8 + -1x + -1(-1 + x) = 39 20 + -8 + -1x + (-1 * -1 + x * -1) = 39 20 + -8 + -1x + (1 + -1x) = 39 Reorder the terms: 20 + -8 + 1 + -1x + -1x = 39 Combine like terms: 20 + -8 = 12 12 + 1 + -1x + -1x = 39 Combine like terms: 12 + 1 = 13 13 + -1x + -1x = 39 Combine like terms: -1x + -1x = -2x 13 + -2x = 39 Solving 13 + -2x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -2x = 39 + -13 Combine like terms: 13 + -13 = 0 0 + -2x = 39 + -13 -2x = 39 + -13 Combine like terms: 39 + -13 = 26 -2x = 26 Divide each side by '-2'. x = -13 Simplifying x = -13
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