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Mathematics 7 Online
OpenStudy (anonymous):

13x² - (10x² + 9) Is 3x² + 9 correct?

OpenStudy (anonymous):

flawless!

OpenStudy (anonymous):

I finally get it! Thank you UditKulka!

OpenStudy (anonymous):

nope nope it should be -9

OpenStudy (anonymous):

it is because -(+) is -

OpenStudy (anonymous):

3x2-9

OpenStudy (anonymous):

else everything is good!

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