Question

e. ( -300) : 20 +5.(3x-1) = 25

Answer 1

( - 300 ) : 20 + 5( 3x -1 ) = 25 

- 15 + 5( 3x -1 ) = 25

-15 + 15x -5 = 25

- 20 + 15x = 25

15x - 20 = 25

15x - 20 + 20 = 25 + 20

15x = 25 + 20

15x = 45

15x : 15 = 45 : 15

x = 45 : 15

x = 3 

vậy x = 3

Answer 2

\(\left(-300\right):20+5.\left(3x-1\right)=25\)

\(\Rightarrow-15+15x-5=25\)

\(\Rightarrow-20x+15x=25\)

\(\Rightarrow15x=45\)

\(\Rightarrow x=3\)

Answer 3

x=3

Answer 4

-15+5. (3x-1)=25

-10.(3x-1)=25

3x-1=25:-10

3x-1=-2,5 

3x= -2,5+1

3x=-1,5

x=-0,5

Answer 5

X= -0,5