(6b-9)(9b+6)-9b(6b+9)=
54b²+36b-81b-54-54b²-81b=
36b-54=
(36*5,3)-54=
190,8-54=
136,8
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(6b-9)(9b+6)-9b(6b+9)=
54b²+36b-81b-54-54b²-81b=
36b-54=
(36*5,3)-54=
190,8-54=
136,8