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x in (-oo:+oo)
7.9 = x/2 // - x/2
7.9-(x/2) = 0
7.9-1/2*x = 0 // - 7.9
-1/2*x = -7.9 // : -1/2
x = -7.9/(-1/2)
x = 15.8
x = 15.8
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