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c) 600 : (30 x c - 100) + 17=20

Răspuns :

600 : ( 30×c - 100 )+17=20 /-17

600 : ( 30×c -100 ) =3

( 30×c-100 ) = 600:3

( 30×c-100 ) =200

30×c=200+100

30×c=300

c=300:30

c=10