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r in (-oo:+oo)
9*(3/4) = r-(6*(2/9)) // - r-(6*(2/9))
9*(3/4)-r+6*(2/9) = 0
97/12-r = 0 // - 97/12
-r = -97/12 // * -1
r = 97/12
r = 97/12
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