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3-6(4a+10)=-81
We move all terms to the left:
3-6(4a+10)-(-81)=0
We add all the numbers together, and all the variables
-6(4a+10)+84=0
We multiply parentheses
-24a-60+84=0
We add all the numbers together, and all the variables
-24a+24=0
We move all terms containing a to the left, all other terms to the right
-24a=-24
a=-24/-24
a=1
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