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n in (-oo:+oo)
((-(12*n)-50)/5)/3 = 0
((-12*n-50)/5)/3 = 0
(-12*n-50)/(3*5) = 0
-12*n-50 = 0 // + 50
-12*n = 50 // : -12
n = 50/(-12)
n = -25/6
n = -25/6
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