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u in (-oo:+oo)
(-1/4)*u+5/2 = (7/2)*u+7/2 // - (7/2)*u+7/2
(-1/4)*u-((7/2)*u)+5/2-(7/2) = 0
(-1/4)*u+(-7/2)*u+5/2-7/2 = 0
-15/4*u-1 = 0 // + 1
-15/4*u = 1 // : -15/4
u = 1/(-15/4)
u = -4/15
u = -4/15
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