-10x-7<13

-10x-7 < 13 

      +7      +7        ---Add 7 to both sides

-10x < 20

-(-10x < 20)          --Times everything by a minus. This switches the < sign to a > sign though.

10x > -20

÷10   ÷10               ---Divide both sides by 10.

x > -2

This is saying that x could equal anything above -2.

Let's test it by putting in a number that is larger than -2 for x. I'll use 6.

-10(6)-7<13

-60-7 < 10

-67 < 10  ✔

At first glance, -67 might look bigger than 10, but we have to remember the negative sign before the 67.  

So -67 is smaller than 10, and it works.

x>−2 

Excellent, ND !!!

That was one that could trip you up pretty easily if you're not careful........

"Thumbs" and Points......