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