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u in (-oo:+oo)
(-2/3)*u-(1/3) = (5/4)*u-7 // - (5/4)*u-7
(-2/3)*u-((5/4)*u)-(1/3)+7 = 0
(-2/3)*u+(-5/4)*u-1/3+7 = 0
20/3-23/12*u = 0 // - 20/3
-23/12*u = -20/3 // : -23/12
u = -20/3/(-23/12)
u = 80/23
u = 80/23
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