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2a-7=9a.4a=
We move all terms to the left:
2a-7-(9a.4a)=0
We add all the numbers together, and all the variables
2a-(+9a.4a)-7=0
We get rid of parentheses
2a-9a.4a-7=0
We move all terms containing a to the left, all other terms to the right
2a-9a.4a=7
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