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m in (-oo:+oo)
111/21 = m+2/3 // - m+2/3
111/21-m-(2/3) = 0
111/21-m-2/3 = 0
97/21-m = 0 // - 97/21
-m = -97/21 // * -1
m = 97/21
m = 97/21
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