2x+7=21-5x

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Solution for 2x+7=21-5x equation: 



2x+7=21-5x

We move all terms to the left:

2x+7-(21-5x)=0

We add all the numbers together, and all the variables

2x-(-5x+21)+7=0

We get rid of parentheses

2x+5x-21+7=0

We add all the numbers together, and all the variables

7x-14=0

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

7x=14

x=14/7

x=2

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