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6x{[(75-5x13)x5-43]x7+1}

Răspuns :

6x{[(75-5x13)x5-43]x7+1}=6x{[(75-65)x5-43]x7+1}=6x[10x5-43]x7+1=6x[50-43]x7+1=6x7x7+1=294+1=295




6x{[(75-5x13)x5-43]x7+1}=300