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n in (-oo:+oo)
((12-n)^1)/2 = ((n/5)^1)/2 // - ((n/5)^1)/2
((12-n)^1)/2-(((n/5)^1)/2) = 0
(12-n)/2+(-1/10)*n = 0
(12-n)/2-n/10 = 0
(10*(12-n))/(2*10)+(2*(-n))/(2*10) = 0
10*(12-n)+2*(-n) = 0
120-12*n = 0
(120-12*n)/(2*10) = 0
(120-12*n)/(2*10) = 0 // * 2*10
120-12*n = 0
120-12*n = 0 // - 120
-12*n = -120 // : -12
n = -120/(-12)
n = 10
n = 10
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