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x in (-oo:+oo)
(7/8)*y-((2/3)*x) = 8 // - 8
(7/8)*y-((2/3)*x)-8 = 0
(-2/3)*x+(7/8)*y-8 = 0
7/8*y-2/3*x-8 = 0 // - 7/8*y-8
-2/3*x = -(7/8*y-8) // : -2/3
x = (-(7/8*y-8))/(-2/3)
x = -3/2*(8-(7/8*y))
x = -3/2*(8-(7/8*y))
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