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u in (-oo:+oo)
(-1/2)*u-5 = (7/5)*u-(2/5) // - (7/5)*u-(2/5)
(-1/2)*u-((7/5)*u)+2/5-5 = 0
(-1/2)*u+(-7/5)*u+2/5-5 = 0
-19/10*u-23/5 = 0 // + 23/5
-19/10*u = 23/5 // : -19/10
u = 23/5/(-19/10)
u = -46/19
u = -46/19
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