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x in (-oo:+oo)
9*((17/18)*x-((7/27)*y)) = 0
9*((17/18)*x+(-7/27)*y) = 0
9*(17/18*x-7/27*y) = 0
( 17/18*x-7/27*y )
17/18*x-7/27*y = 0 // + -7/27*y
17/18*x = -(-7/27*y) // : 17/18
x = (-(-7/27*y))/17/18
x = 14/51*y
( 9 )
9 = 0
x belongs to the empty set
x = 14/51*y
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