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u in (-oo:+oo)
54 = -u/7 // + -u/7
54-(-u/7) = 0
(1/7)*u+54 = 0
1/7*u+54 = 0 // - 54
1/7*u = -54 // : 1/7
u = -54/1/7
u = -378
u = -378
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