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16a+589=11a-221
We move all terms to the left:
16a+589-(11a-221)=0
We get rid of parentheses
16a-11a+221+589=0
We add all the numbers together, and all the variables
5a+810=0
We move all terms containing a to the left, all other terms to the right
5a=-810
a=-810/5
a=-162
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