1) X+(X+1)+(X+2)=9; (Z-2)+(z-1)=-3; 21+(20-4x)-(11-1x)=0. 2) 2u-3(7-2u)=3;...

Question

1) X+(X+1)+(X+2)=9; (Z-2)+(z-1)=-3; 21+(20-4x)-(11-1x)=0.
2) 2u-3(7-2u)=3; 12-y=5(4-2y)+10; 2-2(x-8)=4x-4.
3) 3-5/7t=1-3/7t; 1/8u-2=5/8u+1; 2/5z-7=3.

Answer 1

1)1.3x+3=9
3x=6
x=2
2.(z-2)+(z-1)=-3
2z-3=-3
2z=0
z=0
3.21+(20-4x)-(11-1x)=0
21+20-4х-11+1х=0
30-3х=0
-3х=-30
х=10
2) 1.2u-21+6u=3
3u=24
u=8
2. 12-y=20-10y+10
-y+10y=-12+20+10
9y=18
y=2
3.2-2x+16=4x-4
-2x-4x=-2-16-4
-6x=-22
x=22/6=11/3
3) 1. 3-5/7t=1-3/7t
3-5/7t-1+3/7t=0
2/7t=0
t=o
2. 1/8u-2=5/8u+1
1/8u-2-5/8u-1=o
-3+4/8u=o
4/8u=3
u=24/4=6
3. 2/5z=3
z=3/2/5=15/2=7,5