6=21-5x

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Solution for 6=21-5x equation: 



6=21-5x

We move all terms to the left:

6-(21-5x)=0

We add all the numbers together, and all the variables

-(-5x+21)+6=0

We get rid of parentheses

5x-21+6=0

We add all the numbers together, and all the variables

5x-15=0

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

5x=15

x=15/5

x=3

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