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7a=4+5a
We move all terms to the left:
7a-(4+5a)=0
We add all the numbers together, and all the variables
7a-(5a+4)=0
We get rid of parentheses
7a-5a-4=0
We add all the numbers together, and all the variables
2a-4=0
We move all terms containing a to the left, all other terms to the right
2a=4
a=4/2
a=2
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