3(x+2=21)

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



3(x+2=21)

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(x-19)=0

We multiply parentheses

3x-57=0

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

3x=57

x=57/3

x=19

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