a-5=7-a

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Solution for a-5=7-a equation: 



a-5=7-a

We move all terms to the left:

a-5-(7-a)=0

We add all the numbers together, and all the variables

a-(-1a+7)-5=0

We get rid of parentheses

a+1a-7-5=0

We add all the numbers together, and all the variables

2a-12=0

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

2a=12

a=12/2

a=6

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