The cost of renting a game is described by f(x)=5x+4 in which f(x) is the cost and x is the number of days. Bruce has $35 to spend. how many days can he rent a game if tax is not considered?

he cost of renting a game is described by f(x)=5x+4 in which f(x) is the cost and x is the number of days. Bruce has $35 to spend. how many days can he rent a game if tax is not considered?