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u in (-oo:+oo)
-3.2 = u/3+4.3 // - u/3+4.3
-(u/3)-4.3-3.2 = 0
-1/3*u-7.5 = 0 // + 7.5
-1/3*u = 7.5 // : -1/3
u = 7.5/(-1/3)
u = -22.50000023
u = -22.50000023
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