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31 May, 07:10

9x+3y+12y-0.9x=9x + (-0.9x) + 3y+12y The equation is Commutative Property ... How did they get that second equation?

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  1. 31 May, 07:27
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    Oh how I miss the days when math was as simple as 2+2=4.

    Educated guess here: By putting parentheses.
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