3q + 7p²- 2r³ + 4 ) - ( 4p² - 2 q + 7 r³ - 3 ) = ___________. *
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3q+7p²-2r³+4-4p²+2q-7r³+3
-2r³-7r³+7p²-4p²+3q+2q+4+3
=-9r³+3p²+5q+7
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