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m in (-oo:+oo)
5*m-7 = 7*m-15 // - 7*m-15
5*m-(7*m)-7+15 = 0
5*m-7*m-7+15 = 0
8-2*m = 0 // - 8
-2*m = -8 // : -2
m = -8/(-2)
m = 4
m = 4
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