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45:ax100=900
25x4:a=20
824-240:a=800
245+50xa=745
a:9x8=808
ax6:9=32
a:2+45-25:(36-99:9)=73


Răspuns :

45:a×100=900
45:a=900:100
45:a=9
a=45:9
a=5