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(6-30:a+5x5):5=5 de unde a=6?

Răspuns :

(6-30÷a+25)÷5=5 :: : (6-30÷a+25=5×5 (6-30÷a+25=25 (6-30÷a=25-25 6-30÷a=0
30÷a=0+6
30÷a=6
a=30÷6
a=5