(2p+5q-10r-14) - (2p-9q+2r-8)
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Answer:
=2p+5q-10r-14-2p+9q-2r+8
=2p-2p+5q+9q-10r-2r-14+8
=14q-12r-6
q+r=1/14-12-6
q+r=-1/4
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