express 42/-63 as a rational number with denominator 3

The given number is    42-63 or -4263Now, to obtain an equivalent fraction of -4263 having denominator 3, we will divide each numerator and denominator by 21.42-63 = -42 ÷ 2163 ÷ 21 = -23

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can you explain it in detail can you explain it in det  
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