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u in (-oo:+oo)
(-2/7)*u-(9/5) = -3/2 // + -3/2
(-2/7)*u-(9/5)-(-3/2) = 0
(-2/7)*u-9/5+3/2 = 0
-2/7*u-3/10 = 0 // + 3/10
-2/7*u = 3/10 // : -2/7
u = 3/10/(-2/7)
u = -21/20
u = -21/20
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