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31=2a+5
We move all terms to the left:
31-(2a+5)=0
We get rid of parentheses
-2a-5+31=0
We add all the numbers together, and all the variables
-2a+26=0
We move all terms containing a to the left, all other terms to the right
-2a=-26
a=-26/-2
a=+13
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