-3(2x+1)=-21

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Solution for -3(2x+1)=-21 equation: 



-3(2x+1)=-21

We move all terms to the left:

-3(2x+1)-(-21)=0

We add all the numbers together, and all the variables

-3(2x+1)+21=0

We multiply parentheses

-6x-3+21=0

We add all the numbers together, and all the variables

-6x+18=0

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

-6x=-18

x=-18/-6

x=+3

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