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Simplifying xy + -1[xy + xz + -1x + -1(2x + -1xz) + 2x + -2xz] + -1x = 0 xy + -1[xy + xz + -1x + (2x * -1 + -1xz * -1) + 2x + -2xz] + -1x = 0 xy + -1[xy + xz + -1x + (-2x + 1xz) + 2x + -2xz] + -1x = 0 Reorder the terms: xy + -1[-1x + -2x + 2x + xy + xz + 1xz + -2xz] + -1x = 0 Combine like terms: -1x + -2x = -3x xy + -1[-3x + 2x + xy + xz + 1xz + -2xz] + -1x = 0 Combine like terms: -3x + 2x = -1x xy + -1[-1x + xy + xz + 1xz + -2xz] + -1x = 0 Combine like terms: xz + 1xz = 2xz xy + -1[-1x + xy + 2xz + -2xz] + -1x = 0 Combine like terms: 2xz + -2xz = 0 xy + -1[-1x + xy + 0] + -1x = 0 xy + -1[-1x + xy] + -1x = 0 xy + [-1x * -1 + xy * -1] + -1x = 0 xy + [1x + -1xy] + -1x = 0 Reorder the terms: 1x + -1x + xy + -1xy = 0 Combine like terms: 1x + -1x = 0 0 + xy + -1xy = 0 xy + -1xy = 0 Combine like terms: xy + -1xy = 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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