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2a+8=13a+3
We move all terms to the left:
2a+8-(13a+3)=0
We get rid of parentheses
2a-13a-3+8=0
We add all the numbers together, and all the variables
-11a+5=0
We move all terms containing a to the left, all other terms to the right
-11a=-5
a=-5/-11
a=5/11
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