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