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x in (-oo:+oo)
10-(8*x) = 29/5 // - 29/5
10-(8*x)-(29/5) = 0
10-8*x-29/5 = 0
21/5-8*x = 0 // - 21/5
-8*x = -21/5 // : -8
x = -21/5/(-8)
x = 21/40
x = 21/40
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