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(1/2)*x^6*y^3*(8*x+7*y-9) = 0
1/2*x^6*y^3*(8*x+7*y-9) = 0
( 1/2*x^6*y^3 )
1/2*x^6*y^3 = 0 // : 1/2*y^3
x^6 = 0
x = 0
( 8*x+7*y-9 )
8*x+7*y-9 = 0 // - 7*y-9
8*x = -(7*y-9) // : 8
x = (-(7*y-9))/8
x = (9-(7*y))/8
x in { 0, (9-(7*y))/8 }
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