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(5²) ¹⁴ : 25¹²– 5 × (55¹+ x : 5) = 5²​

Răspuns :

5^28:5^24-5 x (55+x:5)=25
5^4-5 x (55+x:5)=25
625-5 x (55+x:5)=25 | :5
125 - (55+x:5)=5
55+x:5=120
x:5=65
x=13