A plumber charges $50 for every house call and an additional $70 for each hour of work. For one house call yesterday, the plumber earned $435. Which equation can be solved to find the number of hours the plumber worked on the house call?

A * (0.435 = 70x + 50)

B * 0.435 = (50 + 70) * x

C * 0.435 = (x + 70) + 50

D * (0.435 = 50x + 7)