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x in (-oo:+oo)
y+5 = (-1/9)*(x-4) // - (-1/9)*(x-4)
y-((-1/9)*(x-4))+5 = 0
(1/9)*(x-4)+y+5 = 0
1/9*(x-4)+y+5 = 0
1/9*(x-4)+y+5 = 0
1/9*x+y-4/9+5 = 0
1/9*x+y+41/9 = 0
1/9*x+y+41/9 = 0
1/9*x+y+41/9 = 0 // - y+41/9
1/9*x = -(y+41/9) // : 1/9
x = (-(y+41/9))/1/9
x = -9*(y+41/9)
x = -9*(y+41/9)
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