7x+9=5x+21=

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Solution for 7x+9=5x+21= equation: 



7x+9=5x+21=

We move all terms to the left:

7x+9-(5x+21)=0

We get rid of parentheses

7x-5x-21+9=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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