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n in (-oo:+oo)
(2*n-18)/3 = (2*n-24)/4 // - (2*n-24)/4
(2*n-18)/3-((2*n-24)/4) = 0
(2*n-18)/3+(-1*(2*n-24))/4 = 0
(4*(2*n-18))/(3*4)+(-1*3*(2*n-24))/(3*4) = 0
4*(2*n-18)-1*3*(2*n-24) = 0
2*n = 0
(2*n)/(3*4) = 0
(2*n)/(3*4) = 0 // * 3*4
2*n = 0
2*n = 0 // : 2
n = 0
n = 0
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