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x in (-oo:+oo)
y-8 = (7/8)*(x+2) // - (7/8)*(x+2)
y-((7/8)*(x+2))-8 = 0
(-7/8)*(x+2)+y-8 = 0
y-7/8*(x+2)-8 = 0
y-7/8*(x+2)-8 = 0
y-7/8*x-8-7/4 = 0
y-7/8*x-39/4 = 0
y-7/8*x-39/4 = 0
y-7/8*x-39/4 = 0 // - y-39/4
-7/8*x = -(y-39/4) // : -7/8
x = (-(y-39/4))/(-7/8)
x = -8/7*(39/4-y)
x = -8/7*(39/4-y)
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