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m in (-oo:+oo)
(1/3)*m-2*m-7 = -16/3 // + -16/3
(1/3)*m-2*m-(-16/3)-7 = 0
(1/3)*m-2*m+16/3-7 = 0
-5/3*m-5/3 = 0 // + 5/3
-5/3*m = 5/3 // : -5/3
m = 5/3/(-5/3)
m = -1
m = -1
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