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5(2a-6)=45
We move all terms to the left:
5(2a-6)-(45)=0
We multiply parentheses
10a-30-45=0
We add all the numbers together, and all the variables
10a-75=0
We move all terms containing a to the left, all other terms to the right
10a=75
a=75/10
a=7+1/2
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