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n in (-oo:+oo)
(1/3)*n-5*n-3 = -107/3 // + -107/3
(1/3)*n-5*n-(-107/3)-3 = 0
(1/3)*n-5*n+107/3-3 = 0
98/3-14/3*n = 0 // - 98/3
-14/3*n = -98/3 // : -14/3
n = -98/3/(-14/3)
n = 7
n = 7
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