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x in (-oo:+oo)
(1/6)*x-((1/3)*y) = 9 // - 9
(1/6)*x-((1/3)*y)-9 = 0
(1/6)*x+(-1/3)*y-9 = 0
1/6*x-1/3*y-9 = 0 // + -1/3*y-9
1/6*x = -(-1/3*y-9) // : 1/6
x = (-(-1/3*y-9))/1/6
x = 6*(9-(-1/3*y))
x = 6*(9-(-1/3*y))
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