5x+9=21-2x

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Solution for 5x+9=21-2x equation: 



5x+9=21-2x

We move all terms to the left:

5x+9-(21-2x)=0

We add all the numbers together, and all the variables

5x-(-2x+21)+9=0

We get rid of parentheses

5x+2x-21+9=0

We add all the numbers together, and all the variables

7x-12=0

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

7x=12

x=12/7

x=1+5/7

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