2(a-5)=21

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Solution for 2(a-5)=21 equation: 



2(a-5)=21

We move all terms to the left:

2(a-5)-(21)=0

We multiply parentheses

2a-10-21=0

We add all the numbers together, and all the variables

2a-31=0

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

2a=31

a=31/2

a=15+1/2

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