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n in (-oo:+oo)
1.8 = 2*(n/100) // - 2*(n/100)
1.8-(2*(n/100)) = 0
(-1/50)*n+1.8 = 0
1.8-1/50*n = 0 // - 1.8
-1/50*n = -1.8 // : -1/50
n = -1.8/(-1/50)
n = 90
n = 90
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