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m in (-oo:+oo)
(-3/5)*m-(3/4) = -19/20 // + -19/20
(-3/5)*m-(3/4)-(-19/20) = 0
(-3/5)*m-3/4+19/20 = 0
1/5-3/5*m = 0 // - 1/5
-3/5*m = -1/5 // : -3/5
m = -1/5/(-3/5)
m = 1/3
m = 1/3
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