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7a-74=3a+2
We move all terms to the left:
7a-74-(3a+2)=0
We get rid of parentheses
7a-3a-2-74=0
We add all the numbers together, and all the variables
4a-76=0
We move all terms containing a to the left, all other terms to the right
4a=76
a=76/4
a=19
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