3x+4=21-2x

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Solution for 3x+4=21-2x equation: 



3x+4=21-2x

We move all terms to the left:

3x+4-(21-2x)=0

We add all the numbers together, and all the variables

3x-(-2x+21)+4=0

We get rid of parentheses

3x+2x-21+4=0

We add all the numbers together, and all the variables

5x-17=0

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

5x=17

x=17/5

x=3+2/5

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