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u in (-oo:+oo)
(4/7)*u-(2/5) = -1/2 // + -1/2
(4/7)*u-(2/5)-(-1/2) = 0
(4/7)*u-2/5+1/2 = 0
4/7*u+1/10 = 0 // - 1/10
4/7*u = -1/10 // : 4/7
u = -1/10/4/7
u = -7/40
u = -7/40
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