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x in (-oo:+oo)
(1/5)*x-((8/7)*x) = 1 // - 1
(1/5)*x-((8/7)*x)-1 = 0
(1/5)*x+(-8/7)*x-1 = 0
-33/35*x-1 = 0 // + 1
-33/35*x = 1 // : -33/35
x = 1/(-33/35)
x = -35/33
x = -35/33
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