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