What should be subtracted from 7x2+12xy + z3+ 5 to get 2 z3 + 3 - 6 x2 + 10xy?
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(7x²+12xy+z³+5)-(2z³+3-6x²+10xy)
(7x²-6x²)+(12xy+10xy)+(z³-2z³)+(5+3)
x²+22xy-z³+8
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