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Mathematics, 20.09.2020 04:01 oliviacolaizzi

How would 0.9c + 1.89r = 17.01 be equal to
c= 18.9 - 2.1r and r= -10/21c + 9

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How would 0.9c + 1.89r = 17.01 be equal to
c= 18.9 - 2.1r and r= -10/21c + 9...
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