zapisz równania nie sam wynik
8x +4 = 12







-3x –5= 12x + 5







3/5 x – 4 = 4x + 7


Odpowiedź :

Odpowiedź:

[tex]8x+4=12\\\\8x=12-4\\\\8x=8\ \ /:8\\\\x=1\\\\\\-3x-5=12x+5\\\\-3x-12x=5+5\\\\-15x=10\ \ /:(-15)\\\\x=-\frac{10}{15}\\\\x=-\frac{2}{3}\\\\\\\frac{3}{5}x-4=4x+7\ \ /*5\\\\3x-20=20x+35\\\\3x-20x=35+20\\\\-17x=55\ \ /:(-17)\\\\x=-\frac{55}{17}\\\\x=-3\frac{4}{17}[/tex]

8x + 4 = 12 |-4

8x = 12 - 4

8x = 8 |: 8

x = 1

- 3x - 5 = 12x + 5 | - 12x

- 3x - 12x - 5 = 5 |+5

-3x - 12x = 5 + 5

-15x = 10 |: -15

x = [tex]-\frac{2}{3}[/tex]

3/5 x - 4 = 4x + 7 | * 5

3x - 20 = 20x + 35 |-20

3x - 20x - 20 = 35 |+ 20

3x - 20x = 55

- 17x = 55 |:-17

x = [tex]-\frac{55}{17} = -3\frac{4}{17}[/tex]