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5a+7=8a+19
We move all terms to the left:
5a+7-(8a+19)=0
We get rid of parentheses
5a-8a-19+7=0
We add all the numbers together, and all the variables
-3a-12=0
We move all terms containing a to the left, all other terms to the right
-3a=12
a=12/-3
a=-4
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