4х-7=3,4
4х=3,4+7
4х=10,4
х=10,4:4
х=2,6
5х+5/8=4х-3/8
5х-4х=- 3/8-5/8
х= - 8/8=-1
4-(6n+1)+8n=12
4-6n-1+8n=12
2n=12-4+1
2n=9
2n=9:2
n=4,5
(3у-1)/2=у+1
3у-1=(у+2)*2
3у-1=2у+4
3у-2у=4-1
у=3
5/9m=1/5
m=5/9:1/5
m=5/9*5/1
m=25/9=2 7/9
7k=9k
7k-9k=0
-2k=0
k=0
3)
6y< -12
y< -12:6
y= -2
-4x>8,4
x> -8,4:4
x>-2,1
17-y<=6,3<br>-y<=6,3-17<br>-y<= -10,7<br>y=10,7
(8-3x)/7>2
8-3х=2*7
-3х=14-8
-3х=6
х=-6:3
х= -2
4<=5/9х<br>х>=4:5/9
х>=4*9/5
х>=36/5=7 1/5
13-4х>0
-4х>-13
х>13:4
х>2 1/4