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Stiind ca 5x +7y +30=230,determinati 1000 +2y +3x +2x+ 5y=

Răspuns :

5x+7y+30=230  5x+7y=230-30    5x+7y=200
  1000+2y+3x+2x+5y=1000+5x+7y=1000+200=1200