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-(1+2a)=3a+39
We move all terms to the left:
-(1+2a)-(3a+39)=0
We add all the numbers together, and all the variables
-(2a+1)-(3a+39)=0
We get rid of parentheses
-2a-3a-1-39=0
We add all the numbers together, and all the variables
-5a-40=0
We move all terms containing a to the left, all other terms to the right
-5a=40
a=40/-5
a=-8
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