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n in (-oo:+oo)
(-57/8)*n = -121/4 // + -121/4
(-57/8)*n-(-121/4) = 0
(-57/8)*n+121/4 = 0
121/4-57/8*n = 0 // - 121/4
-57/8*n = -121/4 // : -57/8
n = -121/4/(-57/8)
n = 242/57
n = 242/57
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