Question

add 21 by 30 +(-18 by 30)
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Answer 1

Answer:

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Step-by-step explanation:

$\frac{21}{30} + \frac{-18}{30} \\\\=\frac{21+(-18)}{30} \\=\frac{21-18}{30} \\=\frac{3}{30} \\=\frac{1}{10}$