Question

1. Rezolvati in mulțimea Z ecuatia:
a) 4x-20=0;
b) -3x - 24 = 0; c) 3x +5=11;
d) 2x+6=-10; e) 4x + 7 = 3;
5x-2=-27
8) 5x+3 = -72: h) 3x +5=-37; 1) 7x-3 =-59
-3x-9=-21; k) 4x+11=-37; 1-20 - 4x = -64.​

Answer 1

a) 4x-20=0;

4x=20

x=20/4

x=5

b) -3x - 24 = 0;

-3x=24

x= 24/3

x=8

c) 3x +5=11;

3x=11-5

3x=6

x=6/3

x=2

d) 2x+6=-10

2x= - 10 - 6

2x = -16

x= -16/ 2

x= -8

e) 4x + 7 = 3;

4x = 3-7

4x= -4

x= -1

5x-2=-27

5x = -27 +2

5x = -25

x = -25/5

x = -5

f ) 5x+3 = -72

5x = -72 -3

5x = -69

x= -69 / 5

x  = -13.8

h) 3x +5=-37;

4x= -37 -5

4x =  - 43

x =  -43 /4

x = 10.75

1) 7x-3 =-59

7x = -59 +3

7x =  -56

x = -56/7

x= -8

-3x-9=-21;

-3x = -21 + 9

-3x =  -12

x= -12 / 3

x = -4

k) 4x+11=-37;

4x= -37-11

4x= -48

x = -48/4

x=- 12

1-20 - 4x = -64.​

-4x = -64 - 1 + 20

-4x= -45

x = -45/4

x= 11.25

succes