13x-6x+14x=420

To solve the equation 13x - 6x + 14x = 420, we combine the like terms on the left side:

13x - 6x + 14x = 420 (13 - 6 + 14)x = 420 21x = 420

Next, we divide both sides of the equation by 21 to isolate x:

(21x)/21 = 420/21 x = 20

So the solution to the equation is x = 20.