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2(a-6)+a=18
We move all terms to the left:
2(a-6)+a-(18)=0
We add all the numbers together, and all the variables
a+2(a-6)-18=0
We multiply parentheses
a+2a-12-18=0
We add all the numbers together, and all the variables
3a-30=0
We move all terms containing a to the left, all other terms to the right
3a=30
a=30/3
a=10
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