20 *e -(1950+550)/100=6175 si 35*f+(800-752/4)/2=551

Răspuns :

35 x f + ( 800 - 752 : 4 ) : 2 = 551
35 x f + ( 800 - 188 ) : 2 = 551
35 x f + 612 : 2 = 551
35 x f + 306 = 551
35 x f = 551 - 306
35 x f = 245
f = 245 : 35
f = 7.