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13a+1=11a+19
We move all terms to the left:
13a+1-(11a+19)=0
We get rid of parentheses
13a-11a-19+1=0
We add all the numbers together, and all the variables
2a-18=0
We move all terms containing a to the left, all other terms to the right
2a=18
a=18/2
a=9
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