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m in (-oo:+oo)
1/4-((2/5)*m) = m+1/2 // - m+1/2
1/4-((2/5)*m)-m-(1/2) = 0
(-2/5)*m-m+1/4-1/2 = 0
-7/5*m-1/4 = 0 // + 1/4
-7/5*m = 1/4 // : -7/5
m = 1/4/(-7/5)
m = -5/28
m = -5/28
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