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3(2a+10)=60
We move all terms to the left:
3(2a+10)-(60)=0
We multiply parentheses
6a+30-60=0
We add all the numbers together, and all the variables
6a-30=0
We move all terms containing a to the left, all other terms to the right
6a=30
a=30/6
a=5
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