X-21=711-c

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Solution for X-21=711-c equation: 



X-21=711-X

We move all terms to the left:

X-21-(711-X)=0

We add all the numbers together, and all the variables

X-(-1X+711)-21=0

We get rid of parentheses

X+1X-711-21=0

We add all the numbers together, and all the variables

2X-732=0

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

2X=732

X=732/2

X=366

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