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n in (-oo:+oo)
1/4-(10*n) = -50 // + 50
1/4-(10*n)+50 = 0
1/4-10*n+50 = 0
201/4-10*n = 0 // - 201/4
-10*n = -201/4 // : -10
n = -201/4/(-10)
n = 201/40
n = 201/40
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