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7a-30=5a-6
We move all terms to the left:
7a-30-(5a-6)=0
We get rid of parentheses
7a-5a+6-30=0
We add all the numbers together, and all the variables
2a-24=0
We move all terms containing a to the left, all other terms to the right
2a=24
a=24/2
a=12
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