Question

oblicz: 1.3(z-1)=4(x+3) 2.7x-x-10=12-x 3.5x-2(x-1)=20 4.3x-12=24-2x 5.2x-20=18(x-1)

Answer 1

1.

3(x-1)=4(x+3)

3x - 3 = 4x + 12

3x - 4x = 12 + 3

-x = 15

x = -15

 

 

2.

7x-x-10=12-x

6x + x = 12 + 10

7x = 22

x = 22 : 7

x = 22/7

x = 3 i1/7

 

3.

5x-2(x-1)=20

5x - 2x + 2 = 20

3x = 20 - 2

3x = 18

x = 18 : 3

x = 6

 

4.

3x-12=24-2x

3x + 2x = 24 + 12

5x = 36

x = 36 : 5

x = 7 i 1/5

 

5.

2x-20=18(x-1)

2x - 20 = 18x - 18

2x - 18x = -18 + 20

-16x = 2

x = -2/16

x = -1/8

Answer 2

3x-3=4x+12

3x-4x=12+3

-x=15

x=-15

 

7x-x-10=12-x

6x+x=12+10

7x=22   /:7

x=22/7

x=3i1/7

 

5x-2x+2=20

3x=18   /:3

x=6

 

2x-20=18x-18

2x-18x=-18+20

-16x=2   /:(-16)

x=-1/8