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63-a=74-2a
We move all terms to the left:
63-a-(74-2a)=0
We add all the numbers together, and all the variables
-a-(-2a+74)+63=0
We add all the numbers together, and all the variables
-1a-(-2a+74)+63=0
We get rid of parentheses
-1a+2a-74+63=0
We add all the numbers together, and all the variables
a-11=0
We move all terms containing a to the left, all other terms to the right
a=11
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