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n in (-oo:+oo)
(-3/5)*n+9 = 33/5 // - 33/5
(-3/5)*n-(33/5)+9 = 0
(-3/5)*n-33/5+9 = 0
12/5-3/5*n = 0 // - 12/5
-3/5*n = -12/5 // : -3/5
n = -12/5/(-3/5)
n = 4
n = 4
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