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x in (-oo:+oo)
Y = (-8/9)*x+4 // - (-8/9)*x+4
Y-((-8/9)*x)-4 = 0
Y+(8/9)*x-4 = 0
Y+8/9*x-4 = 0 // - Y-4
8/9*x = -(Y-4) // : 8/9
x = (-(Y-4))/8/9
x = 9/8*(4-Y)
x = 9/8*(4-Y)
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