from 10abc subract 2a²+2abc-4b²
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2a² + 2abc - 4b²
+10abc
+ - -
______________
2a² + 2abc - 4b²
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0
(10abc)-(2a²+2abc-4b²)
=>10abc-2a²-2abc+4b²
=>8abc-2a²+4b²
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