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x in (-oo:+oo)
Y-4 = (-5/9)*(2*x-2) // - (-5/9)*(2*x-2)
Y-((-5/9)*(2*x-2))-4 = 0
(5/9)*(2*x-2)+Y-4 = 0
5/9*(2*x-2)+Y-4 = 0
5/9*(2*x-2)+Y-4 = 0
Y+10/9*x-4-10/9 = 0
Y+10/9*x-46/9 = 0
Y+10/9*x-46/9 = 0
Y+10/9*x-46/9 = 0 // - Y-46/9
10/9*x = -(Y-46/9) // : 10/9
x = (-(Y-46/9))/10/9
x = 9/10*(46/9-Y)
x = 9/10*(46/9-Y)
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