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