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(C-100+2)×5+3=98
(d×4+20):4=12


Răspuns :

(c-100+2)×5=98-3
c-100+2=95:5
c-100=19-2
c=100+17
c=117
(d×4+20)=12×4
4d+20=48
4d=48-20
4d=28
d=28:4
d=7