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m in (-oo:+oo)
2/3-((3*m)/5) = 31/15 // - 31/15
2/3-((3*m)/5)-(31/15) = 0
(-3/5)*m+2/3-31/15 = 0
-3/5*m-7/5 = 0 // + 7/5
-3/5*m = 7/5 // : -3/5
m = 7/5/(-3/5)
m = -7/3
m = -7/3
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