21-8+x=8+9-4

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Solution for 21-8+x=8+9-4 equation: 



21-8+x=8+9-4

We move all terms to the left:

21-8+x-(8+9-4)=0

We add all the numbers together, and all the variables

x+21-8-13=0

We add all the numbers together, and all the variables

x=0

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