Solving inequalities is similar to equations. Step 1: Move the term (move the unknown to the left of the inequality). Step 2: Add and subtract. Step 3: change the coefficient to one (if the coefficient of the unknown term is negative, change the direction of inequality); The steps of the inequality group are the same, and the final intersection (that is, passing through the number axis at the same time) can also be remembered: the same size is the largest.