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If that is a terminating decimal then -0.83333333333 = -83333333333/100000000000

If that is meant to be the recurring decimal -0.8333... with the 3 recurring:

-0.8333... = -(10×0.8333... - 0.8333...)/(10 - 1)

= -(8.333... - 0.8333...)/9

= -7.5/9

= -75/90

= -15/18

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7y ago

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