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x in (-oo:+oo)
y = 8*x-((13/7)*x)-8 // - 8*x-((13/7)*x)-8
(13/7)*x-(8*x)+y+8 = 0
(13/7)*x-8*x+y+8 = 0
y-43/7*x+8 = 0 // - y+8
-43/7*x = -(y+8) // : -43/7
x = (-(y+8))/(-43/7)
x = 7/43*(y+8)
x = 7/43*(y+8)
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