Question

How do you solve `d+ 18= - 27`?

Answer 1

`d=-45`

Explanation:

In solving for `d`, you must find a way to move `+18` to the other side of the equation.
You can do this by applying the basic properties of linear equations. In other words, any operation you perform on one side of the equation must be done on the other.
Mathematically, this is the process you go through:

`d+18=-27`

`18+d=-27`
(This step isn't necessary, but to avoid confusion as I go through the explanation, I will rearrange the equation to make it easily understandable.)

`18+(-18)+d=-27+(-18)`

(As explained above, operations done on one side of the equation must be done on the other. Subtracting `18` or adding `-18` on one side means that you have to do the same to the other side of the equation)

This leads to:
`d=-45`

(Simply combine like terms, and you have yourself an answer)

Hope this helps :)

Answer 2

`-45`

Explanation:

`d+18=-27`

Subtract `18` from both sides.

`d=-27-18=-45`