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