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x/2-((2*y)/5) = 0
x/2+(-2/5)*y = 0
1/2*x-2/5*y = 0 // + -2/5*y
1/2*x = -(-2/5*y) // : 1/2
x = (-(-2/5*y))/1/2
x = 4/5*y
x = 4/5*y
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