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u in (-oo:+oo)
(-2/5)*u-(7/3) = -7/4 // + -7/4
(-2/5)*u-(7/3)-(-7/4) = 0
(-2/5)*u-7/3+7/4 = 0
-2/5*u-7/12 = 0 // + 7/12
-2/5*u = 7/12 // : -2/5
u = 7/12/(-2/5)
u = -35/24
u = -35/24
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