5x=21-7x

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Solution for 5x=21-7x equation: 



5x=21-7x

We move all terms to the left:

5x-(21-7x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

5x+7x-21=0

We add all the numbers together, and all the variables

12x-21=0

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

12x=21

x=21/12

x=1+3/4

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