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-29=7-3a
We move all terms to the left:
-29-(7-3a)=0
We add all the numbers together, and all the variables
-(-3a+7)-29=0
We get rid of parentheses
3a-7-29=0
We add all the numbers together, and all the variables
3a-36=0
We move all terms containing a to the left, all other terms to the right
3a=36
a=36/3
a=12
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