X=7-z

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Solution for X=7-z equation: 



X=7-X

We move all terms to the left:

X-(7-X)=0

We add all the numbers together, and all the variables

X-(-1X+7)=0

We get rid of parentheses

X+1X-7=0

We add all the numbers together, and all the variables

2X-7=0

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

2X=7

X=7/2

X=3+1/2

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