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u in (-oo:+oo)
(1/2)*u-(1/5) = -1/7 // + -1/7
(1/2)*u-(1/5)-(-1/7) = 0
(1/2)*u-1/5+1/7 = 0
1/2*u-2/35 = 0 // + 2/35
1/2*u = 2/35 // : 1/2
u = 2/35/1/2
u = 4/35
u = 4/35
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