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