a-7=-(7-9)

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Solution for a-7=-(7-9) equation: 



a-7=-(7-9)

We move all terms to the left:

a-7-(-(7-9))=0

We add all the numbers together, and all the variables

a-7-(-(-2))=0

We add all the numbers together, and all the variables

a-9=0

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

a=9

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