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u in (-oo:+oo)
(-3/5)*u+7/5 = (-3/2)*u-6 // - (-3/2)*u-6
(-3/5)*u-((-3/2)*u)+7/5+6 = 0
(-3/5)*u+(3/2)*u+7/5+6 = 0
9/10*u+37/5 = 0 // - 37/5
9/10*u = -37/5 // : 9/10
u = -37/5/9/10
u = -74/9
u = -74/9
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