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(9/2)*x-((3/5)*y) = 0
(9/2)*x+(-3/5)*y = 0
9/2*x-3/5*y = 0 // + -3/5*y
9/2*x = -(-3/5*y) // : 9/2
x = (-(-3/5*y))/9/2
x = 2/15*y
x = 2/15*y
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