3(x+13)=21

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Solution for 3(x+13)=21 equation: 



3(x+13)=21

We move all terms to the left:

3(x+13)-(21)=0

We multiply parentheses

3x+39-21=0

We add all the numbers together, and all the variables

3x+18=0

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

3x=-18

x=-18/3

x=-6

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