a²-4b²+6a²-4b-7b²-(5a-3b+5a²) answer
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6a2 - 11b2 - 7b - 5a is correct answer
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<body><center><div><h1><span>A</span><span>B</span><span>H</span><span>I</span><span>S</span><span>H</span><span>E</span><span>K</span>
</h1></div></center></body></html>[/tex]
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