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x in (-oo:+oo)
3.1 = x/2 // - x/2
3.1-(x/2) = 0
3.1-1/2*x = 0 // - 3.1
-1/2*x = -3.1 // : -1/2
x = -3.1/(-1/2)
x = 6.2
x = 6.2
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