2(a+5)=-20

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Solution for 2(a+5)=-20 equation: 



2(a+5)=-20

We move all terms to the left:

2(a+5)-(-20)=0

We add all the numbers together, and all the variables

2(a+5)+20=0

We multiply parentheses

2a+10+20=0

We add all the numbers together, and all the variables

2a+30=0

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

2a=-30

a=-30/2

a=-15

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