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u in (-oo:+oo)
(-3/4)*u-(2/3) = -3/4 // + -3/4
(-3/4)*u-(2/3)-(-3/4) = 0
(-3/4)*u-2/3+3/4 = 0
1/12-3/4*u = 0 // - 1/12
-3/4*u = -1/12 // : -3/4
u = -1/12/(-3/4)
u = 1/9
u = 1/9
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