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Standard form is when the fraction cant be divided further I.e. doesn't have any common factor.
192/-168 dividing by 4 gives 46/-42
further dividing by 2 we get, 23/-22
1 2 1
Standard form exists when p/g become probably co prime and denominator is always +ve. so first of all fraction = -192/168
on divding by 2 and cancelling ....ans = -8/7
0 0 0
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