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x in (-oo:+oo)
(3/9)*x-y = 1/9 // - 1/9
(3/9)*x-y-(1/9) = 0
(3/9)*x-y-1/9 = 0
1/3*x-y-1/9 = 0 // + -y-1/9
1/3*x = -(-y-1/9) // : 1/3
x = (-(-y-1/9))/1/3
x = 3*(y+1/9)
x = 3*(y+1/9)
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