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u in (-oo:+oo)
(1/7)*(6*u+7)-u = (4/3)*(2*u-8)+3/7 // - (4/3)*(2*u-8)+3/7
(1/7)*(6*u+7)-((4/3)*(2*u-8))-u-(3/7) = 0
(1/7)*(6*u+7)+(-4/3)*(2*u-8)-u-3/7 = 0
1/7*(6*u+7)-4/3*(2*u-8)-u-3/7 = 0
(1/7*7*(6*u+7))/7+(-4/3*7*(2*u-8))/7+(7*(-u))/7-3/7 = 0
1/7*7*(6*u+7)-4/3*7*(2*u-8)+7*(-u)-3 = 0
245/3-38/3*u-7*u-3 = 0
245/3-59/3*u-3 = 0
236/3-59/3*u = 0
(236/3-59/3*u)/7 = 0
(236/3-59/3*u)/7 = 0 // * 7
236/3-59/3*u = 0
236/3-59/3*u = 0 // - 236/3
-59/3*u = -236/3 // : -59/3
u = -236/3/(-59/3)
u = 4
u = 4
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