2(a+9)=20

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Solution for 2(a+9)=20 equation: 



2(a+9)=20

We move all terms to the left:

2(a+9)-(20)=0

We multiply parentheses

2a+18-20=0

We add all the numbers together, and all the variables

2a-2=0

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

2a=2

a=2/2

a=1

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