3(1x+3)=21

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Solution for 3(1x+3)=21 equation: 



3(1x+3)=21

We move all terms to the left:

3(1x+3)-(21)=0

We add all the numbers together, and all the variables

3(x+3)-21=0

We multiply parentheses

3x+9-21=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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