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(8/5)*x-((4/5)*y) = 0
(8/5)*x+(-4/5)*y = 0
8/5*x-4/5*y = 0 // + -4/5*y
8/5*x = -(-4/5*y) // : 8/5
x = (-(-4/5*y))/8/5
x = 1/2*y
x = 1/2*y
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