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n in (-oo:+oo)
(2*(n-4))/3 = 5/4 // - 5/4
(2*(n-4))/3-(5/4) = 0
(2*(n-4))/3-5/4 = 0
(2*4*(n-4))/(3*4)+(-5*3)/(3*4) = 0
2*4*(n-4)-5*3 = 0
8*n-47 = 0
(8*n-47)/(3*4) = 0
(8*n-47)/(3*4) = 0 // * 3*4
8*n-47 = 0
8*n-47 = 0 // + 47
8*n = 47 // : 8
n = 47/8
n = 47/8
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