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m in (-oo:+oo)
5.7-(4*(m-5)) = 4/5 // - 4/5
5.7-(4*(m-5))-(4/5) = 0
5.7-4*(m-5)-4/5 = 0
(-4*5*(m-5))/5-4/5+(5*5.7)/5 = 0
5*5.7-4*5*(m-5)-4 = 0
28.5-20*m+96 = 0
124.5-20*m = 0
(124.5-20*m)/5 = 0
(124.5-20*m)/5 = 0 // * 5
124.5-20*m = 0
124.5-20*m = 0 // - 124.5
-20*m = -124.5 // : -20
m = -124.5/(-20)
m = 6.225
m = 6.225
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