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n in (-oo:+oo)
(2*n-4)/5 = (3*n+3)/10 // - (3*n+3)/10
(2*n-4)/5-((3*n+3)/10) = 0
(2*n-4)/5+(-1*(3*n+3))/10 = 0
(10*(2*n-4))/(5*10)+(-1*5*(3*n+3))/(5*10) = 0
10*(2*n-4)-1*5*(3*n+3) = 0
5*n-55 = 0
(5*n-55)/(5*10) = 0
(5*n-55)/(5*10) = 0 // * 5*10
5*n-55 = 0
5*n-55 = 0 // + 55
5*n = 55 // : 5
n = 55/5
n = 11
n = 11
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