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x in (-oo:+oo)
(1/3)*x-((1/9)*y) = 5 // - 5
(1/3)*x-((1/9)*y)-5 = 0
(1/3)*x+(-1/9)*y-5 = 0
1/3*x-1/9*y-5 = 0 // + -1/9*y-5
1/3*x = -(-1/9*y-5) // : 1/3
x = (-(-1/9*y-5))/1/3
x = 3*(5-(-1/9*y))
x = 3*(5-(-1/9*y))
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