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u in (-oo:+oo)
(1/3)*u-(7/6) = -2/7 // + -2/7
(1/3)*u-(7/6)-(-2/7) = 0
(1/3)*u-7/6+2/7 = 0
1/3*u-37/42 = 0 // + 37/42
1/3*u = 37/42 // : 1/3
u = 37/42/1/3
u = 37/14
u = 37/14
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