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(7*u+3)/4 = (8*u-7)/7+6 // - (8*u-7)/7+6
(7*u+3)/4-((8*u-7)/7)-6 = 0
(7*u+3)/4+(-1*(8*u-7))/7-6 = 0
(7*(7*u+3))/(4*7)+(-1*4*(8*u-7))/(4*7)+(-6*4*7)/(4*7) = 0
7*(7*u+3)-1*4*(8*u-7)-6*4*7 = 0
17*u-168+49 = 0
17*u-119 = 0
(17*u-119)/(4*7) = 0
(17*u-119)/(4*7) = 0 // * 4*7
17*u-119 = 0
17*u-119 = 0 // + 119
17*u = 119 // : 17
u = 119/17
u = 7
u = 7
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