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m in (-oo:+oo)
(-3/4)*m-(3/8) = -1/4 // + -1/4
(-3/4)*m-(3/8)-(-1/4) = 0
(-3/4)*m-3/8+1/4 = 0
-3/4*m-1/8 = 0 // + 1/8
-3/4*m = 1/8 // : -3/4
m = 1/8/(-3/4)
m = -1/6
m = -1/6
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