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x in (-oo:+oo)
y = (7/8)*x-13 // - (7/8)*x-13
y-((7/8)*x)+13 = 0
(-7/8)*x+y+13 = 0
y-7/8*x+13 = 0 // - y+13
-7/8*x = -(y+13) // : -7/8
x = (-(y+13))/(-7/8)
x = 8/7*(y+13)
x = 8/7*(y+13)
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