8x-7(-x-12)=-21

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Solution for 8x-7(-x-12)=-21 equation: 



8x-7(-x-12)=-21

We move all terms to the left:

8x-7(-x-12)-(-21)=0

We add all the numbers together, and all the variables

8x-7(-1x-12)-(-21)=0

We add all the numbers together, and all the variables

8x-7(-1x-12)+21=0

We multiply parentheses

8x+7x+84+21=0

We add all the numbers together, and all the variables

15x+105=0

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

15x=-105

x=-105/15

x=-7

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