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u in (-oo:+oo)
(-2/5)*u-(7/5) = -7/4 // + -7/4
(-2/5)*u-(7/5)-(-7/4) = 0
(-2/5)*u-7/5+7/4 = 0
7/20-2/5*u = 0 // - 7/20
-2/5*u = -7/20 // : -2/5
u = -7/20/(-2/5)
u = 7/8
u = 7/8
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