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x in (-oo:+oo)
(5/6)*x-((4/5)*x)-1 = 8 // - 8
(5/6)*x-((4/5)*x)-8-1 = 0
(5/6)*x+(-4/5)*x-8-1 = 0
1/30*x-9 = 0 // + 9
1/30*x = 9 // : 1/30
x = 9/1/30
x = 270
x = 270
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