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a+28=7a-26
We move all terms to the left:
a+28-(7a-26)=0
We get rid of parentheses
a-7a+26+28=0
We add all the numbers together, and all the variables
-6a+54=0
We move all terms containing a to the left, all other terms to the right
-6a=-54
a=-54/-6
a=+9
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