a+2(a+4)=20

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Solution for a+2(a+4)=20 equation: 



a+2(a+4)=20

We move all terms to the left:

a+2(a+4)-(20)=0

We multiply parentheses

a+2a+8-20=0

We add all the numbers together, and all the variables

3a-12=0

We move all terms containing a to the left, all other terms to the right

3a=12

a=12/3

a=4

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