x+21+2x=3x+21

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Solution for x+21+2x=3x+21 equation: 



x+21+2x=3x+21

We move all terms to the left:

x+21+2x-(3x+21)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3x-3x-21+21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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