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5(3a-6)=15
We move all terms to the left:
5(3a-6)-(15)=0
We multiply parentheses
15a-30-15=0
We add all the numbers together, and all the variables
15a-45=0
We move all terms containing a to the left, all other terms to the right
15a=45
a=45/15
a=3
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