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(x/9)*(x-(27*y)+5) = 0
(x/9)*(x-27*y+5) = 0
1/9*x*(x-27*y+5) = 0
( 1/9*x )
1/9*x = 0 // : 1/9
x = 0
( x-27*y+5 )
x-27*y+5 = 0 // - 5-27*y
x = -(5-27*y)
x in { 0, -(5-27*y) }
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