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m in (-oo:+oo)
20/3 = (2/5)*m-7*m+2/3 // - (2/5)*m-7*m+2/3
20/3-(-7*m)-((2/5)*m)-(2/3) = 0
7*m+(-2/5)*m+20/3-2/3 = 0
33/5*m+6 = 0 // - 6
33/5*m = -6 // : 33/5
m = -6/33/5
m = -10/11
m = -10/11
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