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