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8-(10-a)=7
We move all terms to the left:
8-(10-a)-(7)=0
We add all the numbers together, and all the variables
-(-1a+10)+8-7=0
We add all the numbers together, and all the variables
-(-1a+10)+1=0
We get rid of parentheses
1a-10+1=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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