(i) 7/8 ÷ 21/5...

(i) `7/8 ÷ 21/5`

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{90 -(48 - 21)} -: 7

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7 xx {(-3)-(-6)} = 21 = 7 xx (-3) -7 xx (-6) = square-square=square=square=21 (Let's fill the blank squares.)