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x in (-oo:+oo)
x/2+1 = -13/2 // + -13/2
x/2-(-13/2)+1 = 0
x/2+13/2+1 = 0
1/2*x+15/2 = 0 // - 15/2
1/2*x = -15/2 // : 1/2
x = -15/2/1/2
x = -15
x = -15
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