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n in (-oo:+oo)
-6/5 = -((1/5)*(-10*n-4))-6*n // + -((1/5)*(-10*n-4))-6*n
(1/5)*(-10*n-4)-(-6*n)-6/5 = 0
(1/5)*(-10*n-4)+6*n-6/5 = 0
1/5*(-10*n-4)+6*n-6/5 = 0
(1/5*5*(-10*n-4))/5+(5*6*n)/5-6/5 = 0
1/5*5*(-10*n-4)+5*6*n-6 = 0
20*n-6-4 = 0
20*n-10 = 0
(20*n-10)/5 = 0
(20*n-10)/5 = 0 // * 5
20*n-10 = 0
20*n-10 = 0 // + 10
20*n = 10 // : 20
n = 10/20
n = 1/2
n = 1/2
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