12+3x=-21

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Solution for 12+3x=-21 equation: 



12+3x=-21

We move all terms to the left:

12+3x-(-21)=0

We add all the numbers together, and all the variables

3x+33=0

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

3x=-33

x=-33/3

x=-11

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