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(3a+28)=79
We move all terms to the left:
(3a+28)-(79)=0
We get rid of parentheses
3a+28-79=0
We add all the numbers together, and all the variables
3a-51=0
We move all terms containing a to the left, all other terms to the right
3a=51
a=51/3
a=17
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