Question

y - 3 = 9 - y

jedna druga z + 6 = z - 1

z + 12 = 2 z - 2

10 x - 2 = 8

12 x - 6 = 6

3 x - 8 = 5 x - 6

Answer 1

y-3=9-y

y=12-y

2y=12

y=6

 

1/2z+6=z-1

1/2z=z-7

z=2z-14

-z=-14

z=14

 

z+12=2z-2

-z+12=-2

-z=-14

z=14

 

10x-2=8

10x=10

x=1

 

12x-6=6

12x=0

x=0

 

3x-8=5x-6

-2x-8=-6

-2x=2

x=-1

Answer 2

y - 3 = 9 - y

2y=12 /:2

y=6

 

jedna druga z + 6 = z - 1

1/2z-z=-1-6

-1/2z=-7 /:(-1/2)

x=14

 

z + 12 = 2 z - 2

z-2z=-2-12

-z=-14 /*(-1)

z=14

 

10 x - 2 = 8

10x=10  /:10

x=1

 

12 x - 6 = 6

12x=12 /:12

x=1

 

3 x - 8 = 5 x - 6

3x-5x=-6+8

-2x=2 /:(-2)

x=-1