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( b-5).2=30 dau ccccccooooorrrrrooooaaaannnaaa uuuuuurrrrrggggeeeennntttt

Răspuns :

2b-10=30
2b=30+10
2b=40
b=40÷2
b=20
2b-10=30
2b=30+10
2b=40
b=40/2=20