4=-x+21

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Solution for 4=-x+21 equation: 



4=-x+21

We move all terms to the left:

4-(-x+21)=0

We add all the numbers together, and all the variables

-(-1x+21)+4=0

We get rid of parentheses

1x-21+4=0

We add all the numbers together, and all the variables

x-17=0

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

x=17

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