3+10x=x+21

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Solution for 3+10x=x+21 equation: 



3+10x=x+21

We move all terms to the left:

3+10x-(x+21)=0

We get rid of parentheses

10x-x-21+3=0

We add all the numbers together, and all the variables

9x-18=0

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

9x=18

x=18/9

x=2

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