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3(a-6)=2a-(7+a)
We move all terms to the left:
3(a-6)-(2a-(7+a))=0
We add all the numbers together, and all the variables
3(a-6)-(2a-(a+7))=0
We multiply parentheses
3a-(2a-(a+7))-18=0
We calculate terms in parentheses: -(2a-(a+7)), so:We get rid of parentheses
2a-(a+7)
We get rid of parentheses
2a-a-7
We add all the numbers together, and all the variables
a-7
Back to the equation:
-(a-7)
3a-a+7-18=0
We add all the numbers together, and all the variables
2a-11=0
We move all terms containing a to the left, all other terms to the right
2a=11
a=11/2
a=5+1/2
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