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m in (-oo:+oo)
4*m+1/6 = (2/3)*m-13/2 // - (2/3)*m-13/2
4*m-((2/3)*m)+1/6-(-13/2) = 0
4*m+(-2/3)*m+1/6+13/2 = 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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