2x-21+21=87+21

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Solution for 2x-21+21=87+21 equation: 



2x-21+21=87+21

We move all terms to the left:

2x-21+21-(87+21)=0

We add all the numbers together, and all the variables

2x-21+21-108=0

We add all the numbers together, and all the variables

2x-108=0

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

2x=108

x=108/2

x=54

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