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5*x-((2*y)/9) = 0
5*x+(-2/9)*y = 0
5*x-2/9*y = 0 // + -2/9*y
5*x = -(-2/9*y) // : 5
x = (-(-2/9*y))/5
x = 2/45*y
x = 2/45*y
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