Răspuns :
1 2x-1 20 19
x - --- = 10 => -------- = ------ => 2x-1=20 => 2x=20-1 => 2x=19 => x= ----
2 2 2 2
x - --- = 10 => -------- = ------ => 2x-1=20 => 2x=20-1 => 2x=19 => x= ----
2 2 2 2