2x-21+12=x+3

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



2x-21+12=x+3

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2x-x-3-9=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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