9(x-3.1/2×4/7)=0помогите решить уравнение

9 (х-3 1/2 * 4/7) = 0
(9*х) - (9*3 1/2) * (9*4/7) = 0
9х- (9/1*7/2) * (9/1*4/7) = 0
9х = 63/2 * 36/7 = 9*18 = 162
х = 162 : 9 = 18