35×f+(800-752:4):2=551

Răspuns :

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

35×f+(800-752:4):2=551
=35f+(800-752:4)=551×2
35f+(800-725:4)= 1102
35f+(800-181,25)=1102
35f+618,75=1102
35f=483,25
F=13,807142
Succes!