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u in (-oo:+oo)
-((6/7)*u) = 30 // - 30
-((6/7)*u)-30 = 0
(-6/7)*u-30 = 0
-6/7*u-30 = 0 // + 30
-6/7*u = 30 // : -6/7
u = 30/(-6/7)
u = -35
u = -35
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