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Simplifying x(x + 19) + -1x(x + 19) = 0 Reorder the terms: x(19 + x) + -1x(x + 19) = 0 (19 * x + x * x) + -1x(x + 19) = 0 (19x + x2) + -1x(x + 19) = 0 Reorder the terms: 19x + x2 + -1x(19 + x) = 0 19x + x2 + (19 * -1x + x * -1x) = 0 19x + x2 + (-19x + -1x2) = 0 Reorder the terms: 19x + -19x + x2 + -1x2 = 0 Combine like terms: 19x + -19x = 0 0 + x2 + -1x2 = 0 x2 + -1x2 = 0 Combine like terms: x2 + -1x2 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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