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m in (-oo:+oo)
7/10-(2*m) = 1/5 // - 1/5
7/10-(2*m)-(1/5) = 0
7/10-2*m-1/5 = 0
1/2-2*m = 0 // - 1/2
-2*m = -1/2 // : -2
m = -1/2/(-2)
m = 1/4
m = 1/4
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