1/5 х + 2/7 х - 0,75 * 3/5 х = 7/35 х+ 10/35 х - 3/4 *3/5 х = 17/35 х - (3*3)/(4*5) х= 17/35 х - 9/20 х = 68/140 х - 63/140 х = 5/140 х = 1/28 х
х=5
1/28 * 5= 5/28
1/5 х + 2/7 х - 0,75 * 3/5 х = 7/35 х+ 10/35 х - 3/4 *3/5 х = 17/35 х - (3*3)/(4*5) х= 17/35 х - 9/20 х = 68/140 х - 63/140 х = 5/140 х = 1/28 х
х=5
1/28 * 5= 5/28