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Răspuns :

[474+3(4a-12)]:19=30

474+3(4a-12)=30×19

474+3(4a-12)=570

3(4a-12)=474+570

3(4a-12)=1044

4a-12=1044:3

4a-12=348

4a=348+12

4a=360

a=360:4

a=90