X-21=71-x

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Solution for X-21=71-x equation: 



X-21=71-X

We move all terms to the left:

X-21-(71-X)=0

We add all the numbers together, and all the variables

X-(-1X+71)-21=0

We get rid of parentheses

X+1X-71-21=0

We add all the numbers together, and all the variables

2X-92=0

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

2X=92

X=92/2

X=46

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