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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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