Hint for the future: Look to the right of the letter M on your keyboard. Use the shift key to make the less than or greater than symbols. Combine with an equals sign to make less than or equal or greater than or equal. Use both signs to indicate not equal.
is represented by <
is represented by >
is represented by <=
is represented by >=
is represented by <>
Hence:
Solve it the same way you would solve the analogous equation: Just add -20 to both sides.
John
My calculator said it, I believe it, that settles it