subtract 7a-4b-8c+13d from 15a-12b+9c-4d
with method plz
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(15a-12b+9c-4d)-(7a-4b-8c+13d)
15a-12b+9c-4d-7a+4b+8c-13d(on opening bracket)
8a-8b+17c-17d
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