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