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x in (-oo:+oo)
-8*x-(2/5) = -9 // + 9
9-8*x-(2/5) = 0
9-8*x-2/5 = 0
43/5-8*x = 0 // - 43/5
-8*x = -43/5 // : -8
x = -43/5/(-8)
x = 43/40
x = 43/40
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