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-7-(x+14)-(273-9+381)-(-645-x-20)egal cu....

Răspuns :

-7- ( x+14) - (273 - 9 +381) - ( - 645 - x - 20)

= -7 - x -14 - ( 273 - 9 + 381 ) - ( - 645 - x - 20 )

= -7 - x - 14 - 645 - ( - 665 -x )

= -7 - x - 14 - 645 + 665 + x

= - 7 - 14 - 645 + 665

= -1