Question

Aflati numarul natural x pentru care are loc relatia 13 supra 4= 2x plus 5 supra 4

Answer 1

13supra4=2x + 5 totul supra 4 ->
-> 4(2x + 5) = 13*4
8x + 20 = 52 
8x=52-20
8x=32
x=32/8
x=4

Answer 2

13/4=2x+5/4
13/4-5/4=2x
13-5/4=2x
12/4=2x
12/4:2=x
12/4*1/2=x; simplificam pe 12 si cu 2 prin 2 si da 6/4*1/1
6/4*1/1=x
6/4=x
           R:x=6/4