2x+21=4x+42

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Solution for 2x+21=4x+42 equation: 



2x+21=4x+42

We move all terms to the left:

2x+21-(4x+42)=0

We get rid of parentheses

2x-4x-42+21=0

We add all the numbers together, and all the variables

-2x-21=0

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

-2x=21

x=21/-2

x=-10+1/2

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