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