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n in (-oo:+oo)
-45 = (9/5)*n // - (9/5)*n
-((9/5)*n)-45 = 0
(-9/5)*n-45 = 0
-9/5*n-45 = 0 // + 45
-9/5*n = 45 // : -9/5
n = 45/(-9/5)
n = -25
n = -25
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