3*(2+x)=21

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



3(2+x)=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(x+2)-21=0

We multiply parentheses

3x+6-21=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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