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u in (-oo:+oo)
-35 = (5/7)*u // - (5/7)*u
-((5/7)*u)-35 = 0
(-5/7)*u-35 = 0
-5/7*u-35 = 0 // + 35
-5/7*u = 35 // : -5/7
u = 35/(-5/7)
u = -49
u = -49
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