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u in (-oo:+oo)
(-2/3)*u-(9/7) = -3/2 // + -3/2
(-2/3)*u-(9/7)-(-3/2) = 0
(-2/3)*u-9/7+3/2 = 0
3/14-2/3*u = 0 // - 3/14
-2/3*u = -3/14 // : -2/3
u = -3/14/(-2/3)
u = 9/28
u = 9/28
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