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437=361a+21
We move all terms to the left:
437-(361a+21)=0
We get rid of parentheses
-361a-21+437=0
We add all the numbers together, and all the variables
-361a+416=0
We move all terms containing a to the left, all other terms to the right
-361a=-416
a=-416/-361
a=1+55/361
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