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Simplifying (r + -1s) + (s + -1r) = 0 Remove parenthesis around (r + -1s) r + -1s + (s + -1r) = 0 Reorder the terms: r + -1s + (-1r + s) = 0 Remove parenthesis around (-1r + s) r + -1s + -1r + s = 0 Reorder the terms: r + -1r + -1s + s = 0 Combine like terms: r + -1r = 0 0 + -1s + s = 0 -1s + s = 0 Combine like terms: -1s + s = 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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