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