7(1+3x)=-21

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Solution for 7(1+3x)=-21 equation: 



7(1+3x)=-21

We move all terms to the left:

7(1+3x)-(-21)=0

We add all the numbers together, and all the variables

7(3x+1)-(-21)=0

We add all the numbers together, and all the variables

7(3x+1)+21=0

We multiply parentheses

21x+7+21=0

We add all the numbers together, and all the variables

21x+28=0

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

21x=-28

x=-28/21

x=-1+1/3

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