7(1/2x-5)+18-x = 5 2/10
7 (1/2х-5)+18-х = 5 2/10 7/2х-35+18-х = 5 2/10 3 1/2х-х = 5 1/10+35-18 2 1/2х = 22 2/10 х = 440/10 : 5/2 х = 440/10 * 2/5 х = 88/5 х = 17 3/5