form the sum of (2y2+10yz), (-5y2- 7yz- 4z2 (and (3yz+222, subtract the sum of .(3y2) and (-y2+lyz+2z2)
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form the sum of (2y2+10yz), (-5y2- 7yz- 4z2 (and (3yz+222, subtract the sum of .(3y2) and (-y2+lyz+2z2)
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