Answer:
well you should firstcalculate the distance then divide by the primary source and you should be able to get the answer after substituting
Step-by-step explanation:
x = 5
Given
13 = - 7 + 9x - 5x , that is
13 = - 7 + 4x ( add 7 to both sides )
20 = 4x ( divide both sides by 4 )
5 = x
2
english
