What is the solution to the inequality? 10x+18< −2

You first substract 18 from both sides so you get 
10x<-20    you then divide by 10 so the answer is 
x<-2

To solve for the inequality, we need to get x by itself and then simplify if needed.
Remember: What you do to one side of the equation you must apply it to the other side as well (unless it is using the distributive property).

10x +18 < -2

Our first task: Get x on one side (alone).

To get 10x by itself, subtract 18 from both sides.

18 -18 = 0
-2 -18 = -20 (When subtracting negatives from a negative, you're just adding with a negative number).

The inequality now is:
10x < -20

Divide both sides by 10 to find x.

10x/10 = x
-20/10 = -2.

X < -2

I hope this helps!