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5(4a+2a)=60
We move all terms to the left:
5(4a+2a)-(60)=0
We add all the numbers together, and all the variables
5(+6a)-60=0
We multiply parentheses
30a-60=0
We move all terms containing a to the left, all other terms to the right
30a=60
a=60/30
a=2
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