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m in (-oo:+oo)
3*m-1/5 = (2/7)*m+81/70 // - (2/7)*m+81/70
3*m-((2/7)*m)-1/5-(81/70) = 0
3*m+(-2/7)*m-1/5-81/70 = 0
19/7*m-19/14 = 0 // + 19/14
19/7*m = 19/14 // : 19/7
m = 19/14/19/7
m = 1/2
m = 1/2
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