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(3*x+8)/4+(x+55)/7 = 17 // - 17
(3*x+8)/4+(x+55)/7-17 = 0
(7*(3*x+8))/(4*7)+(4*(x+55))/(4*7)+(-17*4*7)/(4*7) = 0
7*(3*x+8)+4*(x+55)-17*4*7 = 0
25*x-476+276 = 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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