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u in (-oo:+oo)
-2/7 = (-1*u)/3-(1/2) // - (-1*u)/3-(1/2)
1/2-((-1*u)/3)-2/7 = 0
(1/3)*u-2/7+1/2 = 0
1/3*u+3/14 = 0 // - 3/14
1/3*u = -3/14 // : 1/3
u = -3/14/1/3
u = -9/14
u = -9/14
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