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m in (-oo:+oo)
(2/3)*m-(3/10) = (1/3)*m+31/30 // - (1/3)*m+31/30
(2/3)*m-((1/3)*m)-(3/10)-(31/30) = 0
(2/3)*m+(-1/3)*m-3/10-31/30 = 0
1/3*m-4/3 = 0 // + 4/3
1/3*m = 4/3 // : 1/3
m = 4/3/1/3
m = 4
m = 4
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