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6-(1+3a)=-13
We move all terms to the left:
6-(1+3a)-(-13)=0
We add all the numbers together, and all the variables
-(3a+1)+6-(-13)=0
We add all the numbers together, and all the variables
-(3a+1)+19=0
We get rid of parentheses
-3a-1+19=0
We add all the numbers together, and all the variables
-3a+18=0
We move all terms containing a to the left, all other terms to the right
-3a=-18
a=-18/-3
a=+6
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