Răspuns :
X-numărul
{[(X-20):5]+40}:3=150
[(X-20):5]+40=150×3
[(X-20):5]+40=450
(X-20):5=450-40
(X-20):5=410
X-20=410×5
X-20=2050
X=2050+20
X=2070
{[(X-20):5]+40}:3=150
[(X-20):5]+40=150×3
[(X-20):5]+40=450
(X-20):5=450-40
(X-20):5=410
X-20=410×5
X-20=2050
X=2050+20
X=2070