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5a-7=2a-79
We move all terms to the left:
5a-7-(2a-79)=0
We get rid of parentheses
5a-2a+79-7=0
We add all the numbers together, and all the variables
3a+72=0
We move all terms containing a to the left, all other terms to the right
3a=-72
a=-72/3
a=-24
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