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x in (-oo:+oo)
9*y = (13*x)/3 // - (13*x)/3
9*y-((13*x)/3) = 0
(-13/3)*x+9*y = 0
9*y-13/3*x = 0 // - 9*y
-13/3*x = -(9*y) // : -13/3
x = (-(9*y))/(-13/3)
x = 27/13*y
x = 27/13*y
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