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u in (-oo:+oo)
2/5-6*u = (-1/3)*u-(7/3) // - (-1/3)*u-(7/3)
2/5-6*u-((-1/3)*u)+7/3 = 0
(1/3)*u-6*u+2/5+7/3 = 0
41/15-17/3*u = 0 // - 41/15
-17/3*u = -41/15 // : -17/3
u = -41/15/(-17/3)
u = 41/85
u = 41/85
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