0
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(21 - (4 x 5))3
(6 x 5)-7-2 = 21
2/3 +4/7 = 14/21 + 12/21 = 26/21 = 1 5/21
x - 2 5/7 = 2/3 x - 19/7 = 2/3 x = 2/3 - 19/7 = 14/21 - 57-21 = -43/7 = -6 and 1/7
-3