From the sum of 852 + 2bc, -4b2 - 7bc -c- and 9bc + 5c, subtract the sum of 66 - 6c and 86 +6bc + 22.
7b?from 5a? -9ab2 + 3b and subtract your result from the sum of the two expressions
4ab+ 3b2 - aºb and 2a+b + 7a2 - 4ab2.
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