-84-12x=21+15x

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Solution for -84-12x=21+15x equation: 



-84-12x=21+15x

We move all terms to the left:

-84-12x-(21+15x)=0

We add all the numbers together, and all the variables

-12x-(15x+21)-84=0

We get rid of parentheses

-12x-15x-21-84=0

We add all the numbers together, and all the variables

-27x-105=0

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

-27x=105

x=105/-27

x=-3+8/9

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