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n in (-oo:+oo)
(-1/2)*n-5 = -91/20 // + -91/20
(-1/2)*n-(-91/20)-5 = 0
(-1/2)*n+91/20-5 = 0
-1/2*n-9/20 = 0 // + 9/20
-1/2*n = 9/20 // : -1/2
n = 9/20/(-1/2)
n = -9/10
n = -9/10
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