8x - 12 = 4x
8x - 4x = 12
4x = 12
x = 12/4
x = 3
Answer: 0.1334
Step-by-step explanation:
Given
There are seven trails with a probability of success is 

Using the binomial distribution, the Probability of exactly no success i.e. x=0 is given by

5/100 * 4 = 20/100 reduces to 1/5
Remember when solving inequalities the sign of your inequality reverses when dividing or multiplying negative values. k/-12<15. k>-180 [-180, positive infinity)