8/9х = 2/9 5/9х = 1 4/7х = 16 5х = 4/5
х = 2/9 : 8/9 х = 1 : 5/9 х = 16 : 4/7 х = 4/5 : 5
х = 2/9 * 9/8 х = 9/5 х = 16 * 7/4 х = 4/5 * 1/5
х = 2/8 х = 1 4/5 х = 28 х = 4/25
х = 1/4
х : 9/16 = 32/45 7 1/5 : х = 9/10 6/7х = 2/7 8/11х = 1
х = 32/45 * 9/16 х = 7 1/5 : 9/10 х = 2/7 : 6/7 х = 1 : 8/11
х = 2/5 х = 36/5 * 10/9 х = 2/7 * 7/6 х = 11/8
х = 8 х = 2/6
х = 1/3
5/6х = 25 6х = 1/4 х : 8/25 = 5/32 4 2/7 : х = 6/35
х = 25 : 5/6 х = 1/4 : 6 х = 5/32 * 8/25 30/7 : х = 6/35
х = 25 * 6/5 х = 1/4 * 1/6 х = 1/20 х = 30/7 : 6/35
х = 30 х = 1/24 х = 30/7 * 35/6
х = 25
120x+90(x+4)=2460
120x+90x+360=2460
210x=2460-360
210x=2100:210
x=10( дн)-1 бригада
10+4=14(до)