21x+21=777

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Solution for 21x+21=777 equation: 



21x+21=777

We move all terms to the left:

21x+21-(777)=0

We add all the numbers together, and all the variables

21x-756=0

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

21x=756

x=756/21

x=36

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