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