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n in (-oo:+oo)
(5*n+2)/3+(12-(5*n))/2 = 5 // - 5
(5*n+2)/3+(12-(5*n))/2-5 = 0
(5*n+2)/3+(12-5*n)/2-5 = 0
(2*(5*n+2))/(2*3)+(3*(12-5*n))/(2*3)+(-5*2*3)/(2*3) = 0
2*(5*n+2)+3*(12-5*n)-5*2*3 = 0
40-5*n-30 = 0
10-5*n = 0
(10-5*n)/(2*3) = 0
(10-5*n)/(2*3) = 0 // * 2*3
10-5*n = 0
10-5*n = 0 // - 10
-5*n = -10 // : -5
n = -10/(-5)
n = 2
n = 2
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