Inequalities are just like regular equations with only one exception. Which is when yo multiply or divide by a negative number to both sides of the inequality sign you must flip it. But, for this inequality that rule will no apply. So, what I do to make it easier because I know we all see a different sign in an equation and we start to freak out. So, change the inequality sign to an equals sign to get a hang of working with them.
Example of changing an inequality sign to an equals sign:

Addition property of equality

or
Example of keeping the inequality sign

Addition property of equality

1,400 girls from 16 to 17 do not exercise
Step one
2,500÷25
=100
Step two
100×11
=1,100
Step three
2,500−1,100
=1,400
X=2 because it equals 12.
It's pretty simple
Given: A = 38
B = 75
Solution:
The sum of all angles of a triangle = 180
So,
A + B + C = 180
38 + 75 + C = 180
C = 180 - 113
C = 67
7.87 is what i got :) good luck!!