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m in (-oo:+oo)
(2/5)*m-2*m+3/5 = 83/5 // - 83/5
(2/5)*m-2*m+3/5-(83/5) = 0
(2/5)*m-2*m+3/5-83/5 = 0
-8/5*m-16 = 0 // + 16
-8/5*m = 16 // : -8/5
m = 16/(-8/5)
m = -10
m = -10
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