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m in (-oo:+oo)
(1/4)*m-4 = (2/5)*m-163/40 // - (2/5)*m-163/40
(1/4)*m-((2/5)*m)-(-163/40)-4 = 0
(1/4)*m+(-2/5)*m+163/40-4 = 0
3/40-3/20*m = 0 // - 3/40
-3/20*m = -3/40 // : -3/20
m = -3/40/(-3/20)
m = 1/2
m = 1/2
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