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x in (-oo:+oo)
7/20 = x/8 // - x/8
7/20-(x/8) = 0
7/20-1/8*x = 0 // - 7/20
-1/8*x = -7/20 // : -1/8
x = -7/20/(-1/8)
x = 14/5
x = 14/5
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