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3a+a=24-4
We move all terms to the left:
3a+a-(24-4)=0
We add all the numbers together, and all the variables
3a+a-20=0
We add all the numbers together, and all the variables
4a-20=0
We move all terms containing a to the left, all other terms to the right
4a=20
a=20/4
a=5
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