3(8+x)=21

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Solution for 3(8+x)=21 equation: 



3(8+x)=21

We move all terms to the left:

3(8+x)-(21)=0

We add all the numbers together, and all the variables

3(x+8)-21=0

We multiply parentheses

3x+24-21=0

We add all the numbers together, and all the variables

3x+3=0

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

3x=-3

x=-3/3

x=-1

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