To find the value of x in this equation, you have to isolate it. That isn't possible in the current state of the equation because of the 2 being right next to the parentheses. To get rid of it, distribute:
10x+8=17
Next, you need to get the 8 out of the way. To do this, subtract 8 from both sides, so it's all nice and even:
10x=11
Your final step is to divide both sides by 10 so x can be completely isolated and you can finally get your answer:
x=11/10 or 1.1