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x in (-oo:+oo)
y = (4*x+6)/9 // - (4*x+6)/9
y-((4*x+6)/9) = 0
(-1*(4*x+6))/9+y = 0
(-1*(4*x+6))/9+(9*y)/9 = 0
9*y-1*(4*x+6) = 0
9*y-4*x-6 = 0
(9*y-4*x-6)/9 = 0
(9*y-4*x-6)/9 = 0 // * 9
9*y-4*x-6 = 0
9*y-4*x-6 = 0 // - 9*y-6
-4*x = -(9*y-6) // : -4
x = (-(9*y-6))/(-4)
x = (6-(9*y))/(-4)
x = (6-(9*y))/(-4)
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