7x+1=21-3x

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Solution for 7x+1=21-3x equation: 



7x+1=21-3x

We move all terms to the left:

7x+1-(21-3x)=0

We add all the numbers together, and all the variables

7x-(-3x+21)+1=0

We get rid of parentheses

7x+3x-21+1=0

We add all the numbers together, and all the variables

10x-20=0

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

10x=20

x=20/10

x=2

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