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