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28=5a-6a
We move all terms to the left:
28-(5a-6a)=0
We add all the numbers together, and all the variables
-(-1a)+28=0
We get rid of parentheses
1a+28=0
We add all the numbers together, and all the variables
a+28=0
We move all terms containing a to the left, all other terms to the right
a=-28
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