3x+42=-18x

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Solution for 3x+42=-18x equation: 



3x+42=-18x

We move all terms to the left:

3x+42-(-18x)=0

We get rid of parentheses

3x+18x+42=0

We add all the numbers together, and all the variables

21x+42=0

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

21x=-42

x=-42/21

x=-2

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