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