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(-1/9)*(9*x-(63*y)) = 0
(-1/9)*(9*x-63*y) = 0
-1/9*(9*x-63*y) = 0
( -1/9 )
-1/9 = 0
x belongs to the empty set
( 9*x-63*y )
9*x-63*y = 0 // + -63*y
9*x = -(-63*y) // : 9
x = (-(-63*y))/9
x = 7*y
x = 7*y
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