18/25-21/40=a

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Solution for 18/25-21/40=a equation: 


a in (-oo:+oo)

18/25-(21/40) = a // - a

18/25-a-(21/40) = 0

18/25-a-21/40 = 0

39/200-a = 0 // - 39/200

-a = -39/200 // * -1

a = 39/200

a = 39/200

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