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(4*u-3)/5 = 4-((7*u-2)/4) // - 4-((7*u-2)/4)
(4*u-3)/5+(7*u-2)/4-4 = 0
(4*(4*u-3))/(4*5)+(5*(7*u-2))/(4*5)+(-4*4*5)/(4*5) = 0
4*(4*u-3)+5*(7*u-2)-4*4*5 = 0
51*u-80-22 = 0
51*u-102 = 0
(51*u-102)/(4*5) = 0
(51*u-102)/(4*5) = 0 // * 4*5
51*u-102 = 0
51*u-102 = 0 // + 102
51*u = 102 // : 51
u = 102/51
u = 2
u = 2
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