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n in (-oo:+oo)
(n-3)/4+(n+5)/7 = 5/14 // - 5/14
(n-3)/4+(n+5)/7-(5/14) = 0
(n-3)/4+(n+5)/7-5/14 = 0
(7*14*(n-3))/(4*7*14)+(4*14*(n+5))/(4*7*14)+(-5*4*7)/(4*7*14) = 0
7*14*(n-3)+4*14*(n+5)-5*4*7 = 0
154*n-140-14 = 0
154*n-154 = 0
(154*n-154)/(4*7*14) = 0
(154*n-154)/(4*7*14) = 0 // * 4*7*14
154*n-154 = 0
154*n-154 = 0 // + 154
154*n = 154 // : 154
n = 154/154
n = 1
n = 1
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