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6a=3(a+4)=a
We move all terms to the left:
6a-(3(a+4))=0
We calculate terms in parentheses: -(3(a+4)), so:We get rid of parentheses
3(a+4)
We multiply parentheses
3a+12
Back to the equation:
-(3a+12)
6a-3a-12=0
We add all the numbers together, and all the variables
3a-12=0
We move all terms containing a to the left, all other terms to the right
3a=12
a=12/3
a=4
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