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2*x-(x*((5*y)/4))-(5*y) = 0
2*x+(-5/4)*x*y-5*y = 0
-5/4*x*y-5*y = 0 // + -5*y
-5/4*x*y = -(-5*y) // : -5/4*y
x = (-(-5*y))/(-5/4*y)
x = -4
x = -4
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