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x in (-oo:+oo)

x/3 = y/6 // - y/6

x/3-(y/6) = 0

1/3*x-1/6*y = 0 // + -1/6*y

1/3*x = -(-1/6*y) // : 1/3

x = (-(-1/6*y))/1/3

x = 1/2*y

x = 1/2*y

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