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-13(4=2a)=208
We move all terms to the left:
-13(4-(2a))=0
We add all the numbers together, and all the variables
-13(-2a+4)=0
We multiply parentheses
26a-52=0
We move all terms containing a to the left, all other terms to the right
26a=52
a=52/26
a=2
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