8x-4=x+21

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Solution for 8x-4=x+21 equation: 



8x-4=x+21

We move all terms to the left:

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

We get rid of parentheses

8x-x-21-4=0

We add all the numbers together, and all the variables

7x-25=0

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

7x=25

x=25/7

x=3+4/7

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