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u in (-oo:+oo)
(-7/4)*u-1 = (5/3)*u-(3/4) // - (5/3)*u-(3/4)
(-7/4)*u-((5/3)*u)+3/4-1 = 0
(-7/4)*u+(-5/3)*u+3/4-1 = 0
-41/12*u-1/4 = 0 // + 1/4
-41/12*u = 1/4 // : -41/12
u = 1/4/(-41/12)
u = -3/41
u = -3/41
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