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5a-2a+4b-30b
=3a-26b
b) (7x^2-6xy-11xy^2)-(-6xy^2+4xy-21x^2y)
7x^2-6xy-11xy^2+6xy^2-4xy+21x^2y
=21x^2y+7x^2-10xy-5xy^2
c) 3p-3m/p^2-p+1
bingung