2(x+21)=84

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Solution for 2(x+21)=84 equation: 



2(x+21)=84

We move all terms to the left:

2(x+21)-(84)=0

We multiply parentheses

2x+42-84=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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