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a fost răspuns

[(a+260:2)×3+3]+5-12=998 afla nec

Răspuns :

[(a+130)x3+3]+5-12=998
3a+390+3+5-12=998
3a+386=998
3a=998-386
3a=612
a=204
[(a+260:2)*3+3]+5-12=998          ( * inseamna inmultire)
[(a+130)*3+3]+5-12= 998
(3*a+390+3)+5-12=998
(3*a+393)+5-12=998 ( separam termenii care nu sunt in paranteza)
(3a+393)=998-5+12
(3a+393)=1005 ( scadem 393 din a 2-a ecuatie)
3a= 612
a= 612:3
a= 204