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u in (-oo:+oo)
(-7/2)*u+7/3 = (-5/2)*u-3 // - (-5/2)*u-3
(-7/2)*u-((-5/2)*u)+7/3+3 = 0
(-7/2)*u+(5/2)*u+7/3+3 = 0
16/3-u = 0 // - 16/3
-u = -16/3 // * -1
u = 16/3
u = 16/3
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