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3*x-(5*x)-(x*((4*y)/9))-(y/6)-1 = 0
3*x-5*x+(-4/9)*x*y-(y/6)-1 = 0
-4/9*x*y-1/6*y-1 = 0 // + -1/6*y-1
-4/9*x*y = -(-1/6*y-1) // : -4/9*y
x = (-(-1/6*y-1))/(-4/9*y)
x = -9/4*y^-1*(1-(-1/6*y))
x = -9/4*y^-1*(1-(-1/6*y))
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