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(x*y^2)/3-((4*x)/9) = 13/27 // - 13/27
(x*y^2)/3-((4*x)/9)-(13/27) = 0
(-4/9)*x+(x*y^2)/3-13/27 = 0
1/3*x*y^2-13/27 = 0 // + 13/27
1/3*x*y^2 = 13/27 // : 1/3*y^2
x = 13/27/(1/3*y^2)
x = 13/9*y^-2
x = 13/9*y^-2
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