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