How do you solve this: ga+q=r

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

Can someone me with this problem . show your work .