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x in (-oo:+oo)
10.8 = x/2 // - x/2
10.8-(x/2) = 0
10.8-1/2*x = 0 // - 10.8
-1/2*x = -10.8 // : -1/2
x = -10.8/(-1/2)
x = 21.6
x = 21.6
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