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3(a+9)=a-(8-a)
We move all terms to the left:
3(a+9)-(a-(8-a))=0
We add all the numbers together, and all the variables
3(a+9)-(a-(-1a+8))=0
We multiply parentheses
3a-(a-(-1a+8))+27=0
We calculate terms in parentheses: -(a-(-1a+8)), so:We get rid of parentheses
a-(-1a+8)
We get rid of parentheses
a+1a-8
We add all the numbers together, and all the variables
2a-8
Back to the equation:
-(2a-8)
3a-2a+8+27=0
We add all the numbers together, and all the variables
a+35=0
We move all terms containing a to the left, all other terms to the right
a=-35
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