2(x-3)=21=-3

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Solution for 2(x-3)=21=-3 equation: 



2(x-3)=21=-3

We move all terms to the left:

2(x-3)-(21)=0

We multiply parentheses

2x-6-21=0

We add all the numbers together, and all the variables

2x-27=0

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

2x=27

x=27/2

x=13+1/2

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