HURRY PLS

Why does the equation 7x + 13x - 5- 15 = -10 -10 + 14x + 6x have an infinite number of solutions?

A. Because if you add 20x to both sides of the equation and simplify,
you get -20 = -20

B. Because if you add 20x to both sides of the equation and simplify, you get -20 = 0

C. Because if you subtract 20x from both sides of the equation and simplify, you get -20 = -20

D. Because if you subtract 20x from both sides of the equation and simplify, you get -20 = 0