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3a-2a-4=6+5
We move all terms to the left:
3a-2a-4-(6+5)=0
We add all the numbers together, and all the variables
3a-2a-4-11=0
We add all the numbers together, and all the variables
a-15=0
We move all terms containing a to the left, all other terms to the right
a=15
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