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13=3a+10
We move all terms to the left:
13-(3a+10)=0
We get rid of parentheses
-3a-10+13=0
We add all the numbers together, and all the variables
-3a+3=0
We move all terms containing a to the left, all other terms to the right
-3a=-3
a=-3/-3
a=1
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