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x in (-oo:+oo)
x*((7*y)/8)-7*x-(4*x)-(x*((11*y)/8)) = 0
x*((7*y)/8)-7*x-4*x+(-11/8)*x*y = 0
-1/2*x*y = 0 // : -1/2*y
x = 0
x = 0
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