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(9/4)*x-((5/4)*y) = 0
(9/4)*x+(-5/4)*y = 0
9/4*x-5/4*y = 0 // + -5/4*y
9/4*x = -(-5/4*y) // : 9/4
x = (-(-5/4*y))/9/4
x = 5/9*y
x = 5/9*y
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