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x in (-oo:+oo)
5-((6/7)*x) = x-8 // - x-8
5-((6/7)*x)-x+8 = 0
(-6/7)*x-x+5+8 = 0
13-13/7*x = 0 // - 13
-13/7*x = -13 // : -13/7
x = -13/(-13/7)
x = 7
x = 7
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