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