3a-8a+ 6a-9a+7a+8a - 10a= 4b+5b-4b+6b-8b+7b+4= 3z+8z-5z+9z-8z+4z-3z-9z =
-ab + 8ab-7ab+ab-9ab + 4ab= xy+8xy-9xy-xy+7xy-6xy + 6xy =
6cd - 8cd+cd+ 4cd - 5cd - 6cd + 7cd=
-9ux + 2ux +6ux - 8ux + 3ux-2ux +5ux+3ux =
5xyz+8xyz-9xyz + 4xyz - 5xyz= ​