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x in (-oo:+oo)
y-11 = (-1/2)*(x+8) // - (-1/2)*(x+8)
y-((-1/2)*(x+8))-11 = 0
(1/2)*(x+8)+y-11 = 0
1/2*(x+8)+y-11 = 0
1/2*(x+8)+y-11 = 0
1/2*x+y-11+4 = 0
1/2*x+y-7 = 0
1/2*x+y-7 = 0
1/2*x+y-7 = 0 // - y-7
1/2*x = -(y-7) // : 1/2
x = (-(y-7))/1/2
x = 2*(7-y)
x = 2*(7-y)
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