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(4/3)*y = (-5/4)*x // - (-5/4)*x
(4/3)*y-((-5/4)*x) = 0
(5/4)*x+(4/3)*y = 0
5/4*x+4/3*y = 0 // - 4/3*y
5/4*x = -(4/3*y) // : 5/4
x = (-(4/3*y))/5/4
x = -16/15*y
x = -16/15*y
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