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n in (-oo:+oo)
(7/5)*n-(2*n) = 33/20 // - 33/20
(7/5)*n-(2*n)-(33/20) = 0
(7/5)*n-2*n-33/20 = 0
-3/5*n-33/20 = 0 // + 33/20
-3/5*n = 33/20 // : -3/5
n = 33/20/(-3/5)
n = -11/4
n = -11/4
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