12. Subtract the sum of 3p-2q +2r; 5p+39-2rand - 4p +2q-3r from the sum of
2p-3q-3r; 4p-q-rand 3p+29-3r
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12. Subtract the sum of 3p-2q +2r; 5p+39-2rand - 4p +2q-3r from the sum of
2p-3q-3r; 4p-q-rand 3p+29-3r
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