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x in (-oo:+oo)
2.7 = x/8 // - x/8
2.7-(x/8) = 0
2.7-1/8*x = 0 // - 2.7
-1/8*x = -2.7 // : -1/8
x = -2.7/(-1/8)
x = 21.6
x = 21.6
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