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u in (-oo:+oo)
(-4/7)*u-(8/5) = -3/2 // + -3/2
(-4/7)*u-(8/5)-(-3/2) = 0
(-4/7)*u-8/5+3/2 = 0
-4/7*u-1/10 = 0 // + 1/10
-4/7*u = 1/10 // : -4/7
u = 1/10/(-4/7)
u = -7/40
u = -7/40
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