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38=13-25a
We move all terms to the left:
38-(13-25a)=0
We add all the numbers together, and all the variables
-(-25a+13)+38=0
We get rid of parentheses
25a-13+38=0
We add all the numbers together, and all the variables
25a+25=0
We move all terms containing a to the left, all other terms to the right
25a=-25
a=-25/25
a=-1
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