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Simplifying xy + 7 = yx + 7 Reorder the terms: 7 + xy = yx + 7 Reorder the terms: 7 + xy = 7 + xy Add '-7' to each side of the equation. 7 + -7 + xy = 7 + -7 + xy Combine like terms: 7 + -7 = 0 0 + xy = 7 + -7 + xy xy = 7 + -7 + xy Combine like terms: 7 + -7 = 0 xy = 0 + xy xy = xy Add '-1xy' to each side of the equation. xy + -1xy = xy + -1xy Combine like terms: xy + -1xy = 0 0 = xy + -1xy 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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