12x+42=8x-42

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Solution for 12x+42=8x-42 equation: 



12x+42=8x-42

We move all terms to the left:

12x+42-(8x-42)=0

We get rid of parentheses

12x-8x+42+42=0

We add all the numbers together, and all the variables

4x+84=0

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

4x=-84

x=-84/4

x=-21

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