Any solution of an inequality in one variable is a value of the variable which makes it a true statement.
Thus, we state the following rules for solving an inequality:
Rule 1: Equal numbers may be added to (or subtracted from) both sides of an inequality without affecting the sign of inequality.
Rule 2 : Both sides of an inequality can be multiplied (or divided) by the same positive number. But when both sides are multiplied or divided by a negative number, then the sign of inequality is reversed.