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