a n s w e r . . . please
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(20a+b-c)+(a-20b+c)+(a+b-20c)
= 20a+b-c+a-20b+c+a+b-20c
=20a+a+a+b+b-20b-c+c-20c
=20a+2a+2b-20b-20c
=22a-18b-20c
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