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