50 - 15 = 35
35 ÷ 7 = 5
So there were 5 players and your equation would be:-
50 - 15 ÷ x = 5
x = 7
Hope i helped:P
ANSWER
My answer is in the photo above
EXPLANATION
For all the equations I have used the cross multiplication method although you can also use the LCM method
value of home in 1991= 105% of 170000
value of home in 1992= 105%×105% of 170000
value of home in 1993= 105%×105%×105% of 170000
=$196,796.25