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x in (-oo:+oo)
y-8 = (-1/2)*(x-4) // - (-1/2)*(x-4)
y-((-1/2)*(x-4))-8 = 0
(1/2)*(x-4)+y-8 = 0
1/2*(x-4)+y-8 = 0
1/2*(x-4)+y-8 = 0
1/2*x+y-8-2 = 0
1/2*x+y-10 = 0
1/2*x+y-10 = 0
1/2*x+y-10 = 0 // - y-10
1/2*x = -(y-10) // : 1/2
x = (-(y-10))/1/2
x = 2*(10-y)
x = 2*(10-y)
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