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180-3a=5a-28
We move all terms to the left:
180-3a-(5a-28)=0
We get rid of parentheses
-3a-5a+28+180=0
We add all the numbers together, and all the variables
-8a+208=0
We move all terms containing a to the left, all other terms to the right
-8a=-208
a=-208/-8
a=+26
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