What is the approximate value of R in the equation below?

(76.4) (.32) (R-112) + (.35) (20R+435) = 54

(76.4) (0.32) (R - 112) + (0.35) (20R + 435) = 54

24.448 (R - 112) + 7R + 152.25 = 54

24.448R - 2738.176 + 7R + 152.25 = 54

31.448R - 2585.926 = 54

31.448R = 54 + 2585.926

31.448R = 2639.926

R = 2639.926/31.448

R = 83.9457