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(256+5x)• 12 = 4272.

Răspuns :

(256+5x)x12=4272
256+5x=356
5x=100
x=20
(256+5x)*12= 4272
256+5x= 4272/12 
256+5x= 356
5x= 356-256
5x= 100
x= 100/5
x= 20
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Răspuns: 20