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(1/2)*x+(1/6)*x-((1/3)*y)-((1/2)*y) = 0
(1/2)*x+(1/6)*x+(-1/3)*y+(-1/2)*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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