-13=-21+x

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Solution for -13=-21+x equation: 



-13=-21+x

We move all terms to the left:

-13-(-21+x)=0

We add all the numbers together, and all the variables

-(x-21)-13=0

We get rid of parentheses

-x+21-13=0

We add all the numbers together, and all the variables

-1x+8=0

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

-x=-8

x=-8/-1

x=+8

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