-3x-21=-4x+42

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Solution for -3x-21=-4x+42 equation: 



-3x-21=-4x+42

We move all terms to the left:

-3x-21-(-4x+42)=0

We get rid of parentheses

-3x+4x-42-21=0

We add all the numbers together, and all the variables

x-63=0

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

x=63

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