Question

Rezovati urmatoarele ecuatii in Q

a) 2x-1=9

b) 15x+4= 12x +6

c) 5(x-1)+7(x-2)=5

d) 3x= 5(3x+2)+26

Answer 1

a) 2x=10, x=5

b) 3x=2, x=2/3

c) 12x-19=5, 12x=24, x=2

d) 3x=15x+10+26

12x= -36

x= -3

Answer 2

a)  

2 x - 1 = 9

2 x = 9 + 1

2 x = 10 ⇒  x = 10 / 2 ⇒  x = 5

_______________________-

b)

15 x + 4 = 12 x + 6

15 x - 12 x = 6 - 4

3 x = 2  ⇒   x = 2 / 3

___________________

c)

5 ( x - 1 ) + 7 ( x - 2 ) = 5

5 x - 5 + 7 x - 14 = 5

12 x - 19 = 5

12 x = 5 + 19

12 x = 24 ⇒   x = 24 / 12 ⇒   x = 2

___________________________

d)

3 x = 5 ( 3 x + 2 ) + 26

3 x = 15 x + 10 + 26

3 x - 15 x = 36

- 12 x = 36

x = - 36 / 12 ⇒   x = - 3