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