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I'm stuck on this question!! Plz help me plz I beg u to all the smart ppl

I'm stuck on this question!! Plz help me plz I beg u to all the smart ppl-example-1
User Alexxx
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1 Answer

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= 12x+20y-8z + 3x - 3z
= 12x+3x + 20y -8z-3z
=15x + 20y -12z

Chris :)
User Florent Gz
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