15-6=12x+21

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Solution for 15-6=12x+21 equation: 



15-6=12x+21

We move all terms to the left:

15-6-(12x+21)=0

We add all the numbers together, and all the variables

-(12x+21)+9=0

We get rid of parentheses

-12x-21+9=0

We add all the numbers together, and all the variables

-12x-12=0

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

-12x=12

x=12/-12

x=-1

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