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x in (-oo:+oo)
x/2-x = 3.16 // - 3.16
x/2-x-3.16 = 0
-1/2*x-3.16 = 0 // + 3.16
-1/2*x = 3.16 // : -1/2
x = 3.16/(-1/2)
x = -6.32
x = -6.32
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