7(8+x)=-21

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Solution for 7(8+x)=-21 equation: 



7(8+x)=-21

We move all terms to the left:

7(8+x)-(-21)=0

We add all the numbers together, and all the variables

7(x+8)-(-21)=0

We add all the numbers together, and all the variables

7(x+8)+21=0

We multiply parentheses

7x+56+21=0

We add all the numbers together, and all the variables

7x+77=0

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

7x=-77

x=-77/7

x=-11

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