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Simplifying 20 + -1(8 + -1x) + -1(x + -1) = 39 20 + (8 * -1 + -1x * -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 = 0 13 + 0 = 39 13 = 39 Solving 13 = 39 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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