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(1/3)*x+(1/2)*x+(1/2)*y+(1/7)*y = 0
5/6*x+9/14*y = 0 // - 9/14*y
5/6*x = -(9/14*y) // : 5/6
x = (-(9/14*y))/5/6
x = -27/35*y
x = -27/35*y
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