-x+21=34

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Solution for -x+21=34 equation: 



-x+21=34

We move all terms to the left:

-x+21-(34)=0

We add all the numbers together, and all the variables

-1x-13=0

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

-x=13

x=13/-1

x=-13

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