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-2(1+2a)-(8a+1)=-51
We move all terms to the left:
-2(1+2a)-(8a+1)-(-51)=0
We add all the numbers together, and all the variables
-2(2a+1)-(8a+1)-(-51)=0
We add all the numbers together, and all the variables
-2(2a+1)-(8a+1)+51=0
We multiply parentheses
-4a-(8a+1)-2+51=0
We get rid of parentheses
-4a-8a-1-2+51=0
We add all the numbers together, and all the variables
-12a+48=0
We move all terms containing a to the left, all other terms to the right
-12a=-48
a=-48/-12
a=+4
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