(8)=21-4x

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Solution for (8)=21-4x equation: 



(8)=21-4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

4x-21+8=0

We add all the numbers together, and all the variables

4x-13=0

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

4x=13

x=13/4

x=3+1/4

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