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(607-299):b+299=607-231 cu verificare

Răspuns :

(607-299)÷b+299=607-231
(607-299)÷b+299=376
308÷b=376-299
308÷b=77
        b=308÷77
        b=4

VERIFICARE :
(607-299)÷4+299=376

SUCCES !