21=-3(4x+1)

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Solution for 21=-3(4x+1) equation: 



21=-3(4x+1)

We move all terms to the left:

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



We calculate terms in parentheses: -(-3(4x+1)), so:

-3(4x+1)

We multiply parentheses

-12x-3

Back to the equation:

-(-12x-3)



We get rid of parentheses

12x+3+21=0

We add all the numbers together, and all the variables

12x+24=0

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

12x=-24

x=-24/12

x=-2

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