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u in (-oo:+oo)
(-5/2)*u-7 = (1/3)*u-(7/2) // - (1/3)*u-(7/2)
(-5/2)*u-((1/3)*u)+7/2-7 = 0
(-5/2)*u+(-1/3)*u+7/2-7 = 0
-17/6*u-7/2 = 0 // + 7/2
-17/6*u = 7/2 // : -17/6
u = 7/2/(-17/6)
u = -21/17
u = -21/17
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