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x in (-oo:+oo)
Y = (2/9)*x+4 // - (2/9)*x+4
Y-((2/9)*x)-4 = 0
Y+(-2/9)*x-4 = 0
Y-2/9*x-4 = 0 // - Y-4
-2/9*x = -(Y-4) // : -2/9
x = (-(Y-4))/(-2/9)
x = -9/2*(4-Y)
x = -9/2*(4-Y)
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