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x in (-oo:+oo)
y+5 = (-1/7)*(x-8) // - (-1/7)*(x-8)
y-((-1/7)*(x-8))+5 = 0
(1/7)*(x-8)+y+5 = 0
1/7*(x-8)+y+5 = 0
1/7*(x-8)+y+5 = 0
1/7*x+y-8/7+5 = 0
1/7*x+y+27/7 = 0
1/7*x+y+27/7 = 0
1/7*x+y+27/7 = 0 // - y+27/7
1/7*x = -(y+27/7) // : 1/7
x = (-(y+27/7))/1/7
x = -7*(y+27/7)
x = -7*(y+27/7)
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