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u in (-oo:+oo)
(-1/3)*u+6 = (-3/5)*u-(7/3) // - (-3/5)*u-(7/3)
(-1/3)*u-((-3/5)*u)+7/3+6 = 0
(-1/3)*u+(3/5)*u+7/3+6 = 0
4/15*u+25/3 = 0 // - 25/3
4/15*u = -25/3 // : 4/15
u = -25/3/4/15
u = -125/4
u = -125/4
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