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= 7x -7y
2.= 3p -6q - 5p + 15q
= -2p + 9q
=5x+2x-5y-2y =7x-7y
2). 3(p-2q)-5(p+3q) =3p-6q-5p-15q
=3p-5p-6q-15q =-2p-21q