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u in (-oo:+oo)
(-1/5)*u-(1/2) = -3/7 // + -3/7
(-1/5)*u-(1/2)-(-3/7) = 0
(-1/5)*u-1/2+3/7 = 0
-1/5*u-1/14 = 0 // + 1/14
-1/5*u = 1/14 // : -1/5
u = 1/14/(-1/5)
u = -5/14
u = -5/14
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