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m in (-oo:+oo)
(-1/3)*m+3/4 = 5/8 // - 5/8
(-1/3)*m+3/4-(5/8) = 0
(-1/3)*m+3/4-5/8 = 0
1/8-1/3*m = 0 // - 1/8
-1/3*m = -1/8 // : -1/3
m = -1/8/(-1/3)
m = 3/8
m = 3/8
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