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[(y+540:6)x7-100]:4:5=30

Răspuns :

(y+90) x7-100=600
(y+90)x7=700
Y+90=100
Y=10

Sper ca te-am ajutat!
7(y+90)-100=30x20
7y+630-100=600
7y=600-530=70
y=70 : 7=10