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[12 3/10 + 4 7/19 - 19 4/19 + 3,7]
=[7/4*21/8*22/7*(-8/21)*4/7]/[123/10+83/19-365/19+37/10] =
=[-1*22/7]/[-282/19+160/10] = [-22/7]/[-2820/190+3040/190] =
[-22/7]/[220/190] = [-22/7]*{19/22] = -19/7 = -2 5/7