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u in (-oo:+oo)
18 = (5*u-2)/2+(u+6)/3 // - (5*u-2)/2+(u+6)/3
18-((5*u-2)/2)-((u+6)/3) = 0
(-1*(5*u-2))/2+(-1*(u+6))/3+18 = 0
(-1*3*(5*u-2))/(2*3)+(-1*2*(u+6))/(2*3)+(2*3*18)/(2*3) = 0
2*3*18-1*3*(5*u-2)-1*2*(u+6) = 0
108-17*u-6 = 0
102-17*u = 0
(102-17*u)/(2*3) = 0
(102-17*u)/(2*3) = 0 // * 2*3
102-17*u = 0
102-17*u = 0 // - 102
-17*u = -102 // : -17
u = -102/(-17)
u = 6
u = 6
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