x+x+21=77

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Solution for x+x+21=77 equation: 



x+x+21=77

We move all terms to the left:

x+x+21-(77)=0

We add all the numbers together, and all the variables

2x-56=0

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

2x=56

x=56/2

x=28

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