The equation to solve is:

We need to solve for the variable X, which means to take X to one side and numbers to another.
In solving equations, remember this golden rule.
Side Change = Sign Change
Now, looking at the equation, we can keep X on the left hand side and take "+7" to the right hand side. So we are changing sides of "+7" so taking it to the right hand side, it becomes "-7", so:

We know
-4 -7 = -11
Thus,

The variable X is -11