subtraction 5a2_7ab+5b2 from 3ab_2a2_2b2
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(3ab – 2a2 – 2b2) - (5a2 – 7ab + 5b2)
= 3ab – 2a2 – 2b2 - 5a2 + 7ab - 5b2
= 10ab - 7a2 - -7b2
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