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x in (-oo:+oo)
-x/8 = -2.5 // + 2.5
2.5-x/8 = 0
2.5-1/8*x = 0 // - 2.5
-1/8*x = -2.5 // : -1/8
x = -2.5/(-1/8)
x = 20
x = 20
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