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X in (-oo:+oo)
(3*X+12)/4+(X+27)/7 = 14 // - 14
(3*X+12)/4+(X+27)/7-14 = 0
(7*(3*X+12))/(4*7)+(4*(X+27))/(4*7)+(-14*4*7)/(4*7) = 0
7*(3*X+12)+4*(X+27)-14*4*7 = 0
25*X-392+192 = 0
25*X-200 = 0
(25*X-200)/(4*7) = 0
(25*X-200)/(4*7) = 0 // * 4*7
25*X-200 = 0
25*X-200 = 0 // + 200
25*X = 200 // : 25
X = 200/25
X = 8
X = 8
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