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(8*u-7)/5 = (u-8)/4+6 // - (u-8)/4+6
(8*u-7)/5-((u-8)/4)-6 = 0
(8*u-7)/5+(-1*(u-8))/4-6 = 0
(4*(8*u-7))/(4*5)+(-1*5*(u-8))/(4*5)+(-6*4*5)/(4*5) = 0
4*(8*u-7)-1*5*(u-8)-6*4*5 = 0
27*u-120+12 = 0
27*u-108 = 0
(27*u-108)/(4*5) = 0
(27*u-108)/(4*5) = 0 // * 4*5
27*u-108 = 0
27*u-108 = 0 // + 108
27*u = 108 // : 27
u = 108/27
u = 4
u = 4
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