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7(3a+2)=
We move all terms to the left:
7(3a+2)-()=0
We add all the numbers together, and all the variables
7(3a+2)=0
We multiply parentheses
21a+14=0
We move all terms containing a to the left, all other terms to the right
21a=-14
a=-14/21
a=-2/3
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