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