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3(4+3a)=48
We move all terms to the left:
3(4+3a)-(48)=0
We add all the numbers together, and all the variables
3(3a+4)-48=0
We multiply parentheses
9a+12-48=0
We add all the numbers together, and all the variables
9a-36=0
We move all terms containing a to the left, all other terms to the right
9a=36
a=36/9
a=4
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