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x in (-oo:+oo)
2*y = (3/2)*x-12 // - (3/2)*x-12
2*y-((3/2)*x)+12 = 0
(-3/2)*x+2*y+12 = 0
2*y-3/2*x+12 = 0 // - 2*y+12
-3/2*x = -(2*y+12) // : -3/2
x = (-(2*y+12))/(-3/2)
x = 2/3*(2*y+12)
x = 2/3*(2*y+12)
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