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(a+2)3+4(2a-1)=13
We move all terms to the left:
(a+2)3+4(2a-1)-(13)=0
We multiply parentheses
3a+8a+6-4-13=0
We add all the numbers together, and all the variables
11a-11=0
We move all terms containing a to the left, all other terms to the right
11a=11
a=11/11
a=1
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