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x in (-oo:+oo)
-14.9 = x/8-2.1 // - x/8-2.1
2.1-(x/8)-14.9 = 0
-1/8*x-12.8 = 0 // + 12.8
-1/8*x = 12.8 // : -1/8
x = 12.8/(-1/8)
x = -102.4
x = -102.4
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