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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
40*n-30+45 = 0
40*n+15 = 0
(40*n+15)/5 = 0
(40*n+15)/5 = 0 // * 5
40*n+15 = 0
40*n+15 = 0 // - 15
40*n = -15 // : 40
n = -15/40
n = -3/8
n = -3/8
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