А) 0,6х = -1,8
х=-1.8/0.6
х=-3
б) 7х +35=0
7х=-35
х=-5
в)-3/5х=-15
-3х=-15*5
-3х=-75
х=25
г) 8.31у-71=1.11у+1
8.31у-1.11у=1+71
7.2у=72
у=10
д) 12=(7х-9)-(11-х)
12=7х-9-11+х
12 =8х- 20
-8х=-20-12
х=4
е)(4х+3)-(10х+11)=7+(13-4х)
4х+3-10х-11=20-4х
-6х+4х=20+8
-2х=28
х=-14