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u in (-oo:+oo)
(-7/4)*u+1/2 = (-2/3)*u-4 // - (-2/3)*u-4
(-7/4)*u-((-2/3)*u)+1/2+4 = 0
(-7/4)*u+(2/3)*u+1/2+4 = 0
9/2-13/12*u = 0 // - 9/2
-13/12*u = -9/2 // : -13/12
u = -9/2/(-13/12)
u = 54/13
u = 54/13
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