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= -1a - 1b + 10
b) (9p + 8q - 8r) - (4p - 11q - 9r) = 9p - 4p + 8q +11q - 8r +9r
= 5p + 19q + 1r
=-1a+17b-14
b.9p-4p+8q-11q-8r-9r
=5p-3q-17r
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