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m in (-oo:+oo)
-1/2 = (-1/4)*m+2/5 // - (-1/4)*m+2/5
-((-1/4)*m)-1/2-(2/5) = 0
(1/4)*m-1/2-2/5 = 0
1/4*m-9/10 = 0 // + 9/10
1/4*m = 9/10 // : 1/4
m = 9/10/1/4
m = 18/5
m = 18/5
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