9-x+12+3x=2x+21

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Solution for 9-x+12+3x=2x+21 equation: 



9-x+12+3x=2x+21

We move all terms to the left:

9-x+12+3x-(2x+21)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2x-2x-21+21=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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