(7-9^4)(7+9^4)
-42х-12у
15ав-35а^2-3в^2+7ав=-35а^2+22ав-3в^2
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(7-9^4)(7+9^4)
-42х-12у
15ав-35а^2-3в^2+7ав=-35а^2+22ав-3в^2