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x in (-oo:+oo)
y-2 = (8/7)*(x-7) // - (8/7)*(x-7)
y-((8/7)*(x-7))-2 = 0
(-8/7)*(x-7)+y-2 = 0
y-8/7*(x-7)-2 = 0
y-8/7*(x-7)-2 = 0
y-8/7*x-2+8 = 0
y-8/7*x+6 = 0
y-8/7*x+6 = 0
y-8/7*x+6 = 0 // - y+6
-8/7*x = -(y+6) // : -8/7
x = (-(y+6))/(-8/7)
x = 7/8*(y+6)
x = 7/8*(y+6)
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