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x in (-oo:+oo)
x/2+1 = -4.12 // + 4.12
x/2+1+4.12 = 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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