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2(a+21)=13a=20
We move all terms to the left:
2(a+21)-(13a)=0
We add all the numbers together, and all the variables
-13a+2(a+21)=0
We multiply parentheses
-13a+2a+42=0
We add all the numbers together, and all the variables
-11a+42=0
We move all terms containing a to the left, all other terms to the right
-11a=-42
a=-42/-11
a=3+9/11
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