51 - ( 2660 : 76 + x ) : 23 = 28
51 - ( 35 + x ) : 23 = 28
( 35 + x ) : 23 = 51 - 28
( 35 + x ) : 23 = 23
35 + x = 23 × 23
35 + x = 529
x = 529 - 35
x = 494
( 100 - x : 76 ) × 35 + 1 = 876 /-1
( 100 - x : 76 ) × 35 = 875
( 100 - x : 76 ) = 875 : 35
( 100 - x : 76 ) = 25
x : 76 = 100 - 25
x : 76 = 75
x = 75 × 76
x = 5.700
5^4 : 5^2 + 5 × ( 55^1 - x ) = 5^3
5^2 + 5 × ( 55 - x ) = 125
25 + 5 × ( 55 - x ) = 125
5× ( 55 - x ) = 125 - 25
5 × ( 55 - x ) = 100
55 - x = 100 : 5
55 - x = 20
x = 55 - 20
x = 35
orice nr la puterea 1 este egal cu acel număr.
5^3 = 125
- la impartire , daca avem aceeasi baza , se scad puterile.
