6x+6=21+3x

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



6x+6=21+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

6x-3x-21+6=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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