3x=x-42

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Solution for 3x=x-42 equation: 



3x=x-42

We move all terms to the left:

3x-(x-42)=0

We get rid of parentheses

3x-x+42=0

We add all the numbers together, and all the variables

2x+42=0

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

2x=-42

x=-42/2

x=-21

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