2(a+3)=21

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Solution for 2(a+3)=21 equation: 



2(a+3)=21

We move all terms to the left:

2(a+3)-(21)=0

We multiply parentheses

2a+6-21=0

We add all the numbers together, and all the variables

2a-15=0

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

2a=15

a=15/2

a=7+1/2

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