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n in (-oo:+oo)
(3-n)/7 = (3-n)/4 // - (3-n)/4
(3-n)/7-((3-n)/4) = 0
(3-n)/7+(-1*(3-n))/4 = 0
(4*(3-n))/(4*7)+(-1*7*(3-n))/(4*7) = 0
4*(3-n)-1*7*(3-n) = 0
3*n-9 = 0
(3*n-9)/(4*7) = 0
(3*n-9)/(4*7) = 0 // * 4*7
3*n-9 = 0
3*n-9 = 0 // + 9
3*n = 9 // : 3
n = 9/3
n = 3
n = 3
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