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Simplifying x + -1(x + -5) = 21 Reorder the terms: x + -1(-5 + x) = 21 x + (-5 * -1 + x * -1) = 21 x + (5 + -1x) = 21 Reorder the terms: 5 + x + -1x = 21 Combine like terms: x + -1x = 0 5 + 0 = 21 5 = 21 Solving 5 = 21 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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