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Mathematics, 19.02.2020 22:26 ndkdidnfnk

Simplify this expression (15+6βˆ’2)+(βˆ’52βˆ’18+6) the answer is -6d^2+12d-3 plz show how to do it

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Simplify this expression (15+6βˆ’2)+(βˆ’52βˆ’18+6) the answer is -6d^2+12d-3 plz show how to do it...
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