When added to the number that is produced by doubling the number x the result is equal to 8 times the number that is 5 less than x what is the value of x?

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?