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x in (-oo:+oo)
-2.12 = x/2+3 // - x/2+3
-(x/2)-3-2.12 = 0
-1/2*x-5.12 = 0 // + 5.12
-1/2*x = 5.12 // : -1/2
x = 5.12/(-1/2)
x = -10.24
x = -10.24
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