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-29=1+3a
We move all terms to the left:
-29-(1+3a)=0
We add all the numbers together, and all the variables
-(3a+1)-29=0
We get rid of parentheses
-3a-1-29=0
We add all the numbers together, and all the variables
-3a-30=0
We move all terms containing a to the left, all other terms to the right
-3a=30
a=30/-3
a=-10
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