-7(3+4x)=-21

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Solution for -7(3+4x)=-21 equation: 



-7(3+4x)=-21

We move all terms to the left:

-7(3+4x)-(-21)=0

We add all the numbers together, and all the variables

-7(4x+3)-(-21)=0

We add all the numbers together, and all the variables

-7(4x+3)+21=0

We multiply parentheses

-28x-21+21=0

We add all the numbers together, and all the variables

-28x=0

x=0/-28

x=0

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