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300-b•8-109=47 Ma puteti ajuta?

Răspuns :

300-8b-109=47
300-8b=47+109

300-8b=156
300-156=8b

144=8b
b=18
300-b•8=109+47
300-b•8=156
b•8=300-156
b•8=144
b=144:8
b=18