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x in (-oo:+oo)
2.2/4 = x/16 // - x/16
2.2/4-(x/16) = 0
0.55-1/16*x = 0 // - 0.55
-1/16*x = -0.55 // : -1/16
x = -0.55/(-1/16)
x = 8.8
x = 8.8
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