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(2/5)*x-(5*y) = 0
(2/5)*x-5*y = 0
2/5*x-5*y = 0 // + -5*y
2/5*x = -(-5*y) // : 2/5
x = (-(-5*y))/2/5
x = 25/2*y
x = 25/2*y
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