4x+21=-3x+42

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



4x+21=-3x+42

We move all terms to the left:

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

We get rid of parentheses

4x+3x-42+21=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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