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m in (-oo:+oo)
10-3*m = (1/3)*m+50/3 // - (1/3)*m+50/3
10-3*m-((1/3)*m)-(50/3) = 0
(-1/3)*m-3*m-50/3+10 = 0
-10/3*m-20/3 = 0 // + 20/3
-10/3*m = 20/3 // : -10/3
m = 20/3/(-10/3)
m = -2
m = -2
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