Question

determinati nr necunoscut

Answer 1

b. (x-2)/x=7/13

13(x-2)=7x

13x-26=7x

13x-7x=26

6x=26

x=26/6

x=13/3

c. (3x+4)/(x+5)=5/3

3(3x+4)=5(x+5)

9x+12=5x+25

9x-5x=25-12

4x=13

x=13/4

Answer 2

Salut!

b)

(x-2)/x=7/13

13(x-2)=7x

13x-26=7x

13x-7x=26

6x=26

x=26/6

x=13/3

c)

(3x+4)/(x+5)=5/3

3(3x+4)=5(x+5)

9x+12=5x+25

9x-5x=25-12

4x=13

x=13/4

Succes!