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= -3/7 - 4/9 . 5/6 = 1/7 / 3/-2 + 7/8
= -3/7 - 2/9 . 5/3 = 1/7 * -2/3 + 7/8
= -3/7 - 10/27 = -2/21 + 7/8
-81-70 -16 + 147
= ---------- = -151/189 = ------------- = 131/168
189 168