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n in (-oo:+oo)
9 = (28*n)/5-(3*((4*n)/5-2)) // - (28*n)/5-(3*((4*n)/5-2))
3*((4*n)/5-2)-((28*n)/5)+9 = 0
3*((4*n)/5-2)+(-28/5)*n+9 = 0
3*(4/5*n-2)+(-28*n)/5+9 = 0
(3*5*(4/5*n-2))/5+(-28*n)/5+(5*9)/5 = 0
3*5*(4/5*n-2)-28*n+5*9 = 0
45-16*n-30 = 0
15-16*n = 0
(15-16*n)/5 = 0
(15-16*n)/5 = 0 // * 5
15-16*n = 0
15-16*n = 0 // - 15
-16*n = -15 // : -16
n = -15/(-16)
n = 15/16
n = 15/16
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