3x+6=21+2x+-6

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Solution for 3x+6=21+2x+-6 equation: 



3x+6=21+2x+-6

We move all terms to the left:

3x+6-(21+2x+-6)=0

We add all the numbers together, and all the variables

3x-(2x+15)+6=0

We get rid of parentheses

3x-2x-15+6=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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