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{[(620+880:40):6-(850+350:14):35]*15}:30

Răspuns :

{[(620+880:40):6-(850+350:14):35]*15}:30=
={[(620+22):6-(850+25):35]*15}:30=
=[(642:6-875:35)*15]:30=
=[(107-25)*15]:30=
=(82*15):30=
=1230:30=41
620+880:40=620+22=642
850+350:14=850+25=875

((642:6- 875:35)x15):30=
((107-25)x15):30=
(82x15):30=
1230:30=41