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n in (-oo:+oo)
32 = (4/5)*n // - (4/5)*n
32-((4/5)*n) = 0
(-4/5)*n+32 = 0
32-4/5*n = 0 // - 32
-4/5*n = -32 // : -4/5
n = -32/(-4/5)
n = 40
n = 40
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