3(4-l)=21

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Solution for 3(4-l)=21 equation: 



3(4-l)=21

We move all terms to the left:

3(4-l)-(21)=0

We add all the numbers together, and all the variables

3(-1l+4)-21=0

We multiply parentheses

-3l+12-21=0

We add all the numbers together, and all the variables

-3l-9=0

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

-3l=9

l=9/-3

l=-3

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