-15x-30=21-12x

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Solution for -15x-30=21-12x equation: 



-15x-30=21-12x

We move all terms to the left:

-15x-30-(21-12x)=0

We add all the numbers together, and all the variables

-15x-(-12x+21)-30=0

We get rid of parentheses

-15x+12x-21-30=0

We add all the numbers together, and all the variables

-3x-51=0

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

-3x=51

x=51/-3

x=-17

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