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x in (-oo:+oo)
y+5 = (7/8)*(x-7) // - (7/8)*(x-7)
y-((7/8)*(x-7))+5 = 0
(-7/8)*(x-7)+y+5 = 0
y-7/8*(x-7)+5 = 0
y-7/8*(x-7)+5 = 0
y-7/8*x+5+49/8 = 0
y-7/8*x+89/8 = 0
y-7/8*x+89/8 = 0
y-7/8*x+89/8 = 0 // - y+89/8
-7/8*x = -(y+89/8) // : -7/8
x = (-(y+89/8))/(-7/8)
x = 8/7*(y+89/8)
x = 8/7*(y+89/8)
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