4x+12=-7x-21

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Solution for 4x+12=-7x-21 equation: 



4x+12=-7x-21

We move all terms to the left:

4x+12-(-7x-21)=0

We get rid of parentheses

4x+7x+21+12=0

We add all the numbers together, and all the variables

11x+33=0

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

11x=-33

x=-33/11

x=-3

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