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x in (-oo:+oo)
y-2 = (8/9)*(x+7) // - (8/9)*(x+7)
y-((8/9)*(x+7))-2 = 0
(-8/9)*(x+7)+y-2 = 0
y-8/9*(x+7)-2 = 0
y-8/9*(x+7)-2 = 0
y-8/9*x-56/9-2 = 0
y-8/9*x-74/9 = 0
y-8/9*x-74/9 = 0
y-8/9*x-74/9 = 0 // - y-74/9
-8/9*x = -(y-74/9) // : -8/9
x = (-(y-74/9))/(-8/9)
x = -9/8*(74/9-y)
x = -9/8*(74/9-y)
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