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