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m in (-oo:+oo)
-4/7 = (4/7)*m-2*m+1/2 // - (4/7)*m-2*m+1/2
-(-2*m)-((4/7)*m)-4/7-(1/2) = 0
2*m+(-4/7)*m-4/7-1/2 = 0
10/7*m-15/14 = 0 // + 15/14
10/7*m = 15/14 // : 10/7
m = 15/14/10/7
m = 3/4
m = 3/4
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