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