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u in (-oo:+oo)
u-((9/10)*u)+6 = 11 // - 11
u-((9/10)*u)-11+6 = 0
u+(-9/10)*u-11+6 = 0
1/10*u-5 = 0 // + 5
1/10*u = 5 // : 1/10
u = 5/1/10
u = 50
u = 50
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