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m in (-oo:+oo)
7/10-m = 1/5 // - 1/5
7/10-m-(1/5) = 0
7/10-m-1/5 = 0
1/2-m = 0 // - 1/2
-m = -1/2 // * -1
m = 1/2
m = 1/2
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