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8a-49=5a-19
We move all terms to the left:
8a-49-(5a-19)=0
We get rid of parentheses
8a-5a+19-49=0
We add all the numbers together, and all the variables
3a-30=0
We move all terms containing a to the left, all other terms to the right
3a=30
a=30/3
a=10
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