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-5b+3b-2b+(7b-b+2b)-b=

Răspuns :

-5b+3b-2b+(6b+2b)-b=
-5b+3b-2b+8b-b=
-2b-2b+8b-b=
-4b+8b-b=
4b-b=3b
-5b+3b-2b+(6b+2b)-b=-5b+3b-2b+8B- b=-2b-2b+8b-b=-4b+8b-b=4b-b=3b