3x+10=21-x

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



3x+10=21-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(-1x+21)+10=0

We get rid of parentheses

3x+1x-21+10=0

We add all the numbers together, and all the variables

4x-11=0

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

4x=11

x=11/4

x=2+3/4

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