3x-8=x+21

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Solution for 3x-8=x+21 equation: 



3x-8=x+21

We move all terms to the left:

3x-8-(x+21)=0

We get rid of parentheses

3x-x-21-8=0

We add all the numbers together, and all the variables

2x-29=0

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

2x=29

x=29/2

x=14+1/2

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