What is the solution to 2n-5=8n+7?

Me what is the value of x? showing work would be appreciated - ! : )

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)

Can someone show me step by step how to do this?