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m in (-oo:+oo)
2/5-7*m = 2*m-(41/10) // - 2*m-(41/10)
2/5-7*m-(2*m)+41/10 = 0
2/5-7*m-2*m+41/10 = 0
9/2-9*m = 0 // - 9/2
-9*m = -9/2 // : -9
m = -9/2/(-9)
m = 1/2
m = 1/2
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