Treat them exactly like equations. The only exception is that if you divide by a negative number, the inequality flips.

Divide both sides by -13. When you divide by a negative, flip the inequality.

If you need help understanding math so you can solve these problems yourself, then one on one online tutoring is the answer ($30/hr). If you need faster solutions with guaranteed detailed answers, then go with personal problem solving ($3.50-$5.50 per problem). Contact me at fcabanski@hotmail.com