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