Question

tim x biet: (x+1)+(x-3)=x-2

Answer 1

   

       (x+1)+(x-3)=x-2

<=> x+1+x-3=x-2

<=> x+1+x-3-(x-2)=0

<=> x+1+x-3-x+2=0

<=> (x+x-x)+(1-3+2)=0 <=> x=0

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