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(4/6)*x = (5/6)*y // - (5/6)*y
(4/6)*x-((5/6)*y) = 0
(4/6)*x+(-5/6)*y = 0
2/3*x-5/6*y = 0 // + -5/6*y
2/3*x = -(-5/6*y) // : 2/3
x = (-(-5/6*y))/2/3
x = 5/4*y
x = 5/4*y
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