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