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12(3+a)=48.
We move all terms to the left:
12(3+a)-(48.)=0
We add all the numbers together, and all the variables
12(a+3)-48=0
We multiply parentheses
12a+36-48=0
We add all the numbers together, and all the variables
12a-12=0
We move all terms containing a to the left, all other terms to the right
12a=12
a=12/12
a=1
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