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