D*60=5600-4160
d*60=1440
d=1440/60
d=24
36=30+6 48=40+8 85=80+5 97=90+7
1) 250 - 3у = 115
3у = 250 - 115
3у = 135
у = 135 : 3
у = 45
2) х+3х+2*3х = 120
10х = 120
х = 120 : 10
х = 12
3) 6 - х/8 = 4
х/8 = 6 - 2
х/8 = 4
х = 4/8
х = 0.5
-4,3х=14,62
4,3х=-14,62
х=-3,4