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(x/6)*(x-(30*y)+1) = 0
(x/6)*(x-30*y+1) = 0
1/6*x*(x-30*y+1) = 0
( 1/6*x )
1/6*x = 0 // : 1/6
x = 0
( x-30*y+1 )
x-30*y+1 = 0 // - 1-30*y
x = -(1-30*y)
x in { 0, -(1-30*y) }
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