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u in (-oo:+oo)
-15 = (-3/7)*u // - (-3/7)*u
-((-3/7)*u)-15 = 0
(3/7)*u-15 = 0
3/7*u-15 = 0 // + 15
3/7*u = 15 // : 3/7
u = 15/3/7
u = 35
u = 35
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