-x-15=3x+21

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Solution for -x-15=3x+21 equation: 



-x-15=3x+21

We move all terms to the left:

-x-15-(3x+21)=0

We add all the numbers together, and all the variables

-1x-(3x+21)-15=0

We get rid of parentheses

-1x-3x-21-15=0

We add all the numbers together, and all the variables

-4x-36=0

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

-4x=36

x=36/-4

x=-9

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