-8(4-b) +4(-2b-2) -7(-9+b) =-32+8b-8b-8+63-7b=23-7b
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-32+8b-8b-8+63-7b=-7b+23
-8(4-b) +4(-2b-2) -7(-9+b) =-32+8b-8b-8+63-7b=23-7b