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-5+2(5+4a)=-43
We move all terms to the left:
-5+2(5+4a)-(-43)=0
We add all the numbers together, and all the variables
2(4a+5)-5-(-43)=0
We add all the numbers together, and all the variables
2(4a+5)+38=0
We multiply parentheses
8a+10+38=0
We add all the numbers together, and all the variables
8a+48=0
We move all terms containing a to the left, all other terms to the right
8a=-48
a=-48/8
a=-6
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