Hey there, Guest!
We can go minus both sides of the expression by 20 and obtain the following,
For the values that are not satisfied, we can take all the values between 1/5 and -4.
Values of x that are not satisfied =\([x:−4
which means that the answer to our problem is
When counted, the number of elements, n(x), will give us 4.
And there we have our answer.
Hope this helped! :)
( ﾟдﾟ)つ Bye