8=21-13x

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Solution for 8=21-13x equation: 



8=21-13x

We move all terms to the left:

8-(21-13x)=0

We add all the numbers together, and all the variables

-(-13x+21)+8=0

We get rid of parentheses

13x-21+8=0

We add all the numbers together, and all the variables

13x-13=0

We move all terms containing x to the left, all other terms to the right

13x=13

x=13/13

x=1

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