The answer is nineteen (19).Let us use this equation: 7x-35= 98x stands for the missing number.To solve for x, we will transfer the -35 to the side of 98, and it will look like this: 7x= 98+35 (NOTE: Once we transfer a number on the other side, their signs will change too. For example, the -35 became positive 35 when it was transferred to the side of the 98)Then, 7x= 133, divide both sides by 7 so that the x will remain. 133/7= 19.Therefore, x=19
