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x in (-oo:+oo)
(1/6)*x+(2/3)*y = 4 // - 4
(1/6)*x+(2/3)*y-4 = 0
1/6*x+2/3*y-4 = 0 // - 2/3*y-4
1/6*x = -(2/3*y-4) // : 1/6
x = (-(2/3*y-4))/1/6
x = 6*(4-(2/3*y))
x = 6*(4-(2/3*y))
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