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x in (-oo:+oo)
2.2 = x/2 // - x/2
2.2-(x/2) = 0
2.2-1/2*x = 0 // - 2.2
-1/2*x = -2.2 // : -1/2
x = -2.2/(-1/2)
x = 4.4
x = 4.4
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