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6(2a-1)+3a=54
We move all terms to the left:
6(2a-1)+3a-(54)=0
We add all the numbers together, and all the variables
3a+6(2a-1)-54=0
We multiply parentheses
3a+12a-6-54=0
We add all the numbers together, and all the variables
15a-60=0
We move all terms containing a to the left, all other terms to the right
15a=60
a=60/15
a=4
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