Solve for xxx: dfrac21x−20=dfrac22x+20\\dfrac{21}{x - 20} = \\dfrac{22}{x + 20}dfrac21x−20=dfrac22x+20
x=820x = 820x=820
x=860x = 860x=860
x=900x = 900x=900
x=43x = 43x=43