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u in (-oo:+oo)
(-2/3)*u-(3/2) = -4/7 // + -4/7
(-2/3)*u-(3/2)-(-4/7) = 0
(-2/3)*u-3/2+4/7 = 0
-2/3*u-13/14 = 0 // + 13/14
-2/3*u = 13/14 // : -2/3
u = 13/14/(-2/3)
u = -39/28
u = -39/28
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