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2a-5=9a-19
We move all terms to the left:
2a-5-(9a-19)=0
We get rid of parentheses
2a-9a+19-5=0
We add all the numbers together, and all the variables
-7a+14=0
We move all terms containing a to the left, all other terms to the right
-7a=-14
a=-14/-7
a=+2
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