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(3/4+(2/4-5/4)*1/4)-2/3
(3/4+(-3/4)*1/4)-2/3
(3/4-3/4*1/4)-2/3
(3/4-4/16)-2/3
(3/4-1/4)-2/3
(2/4)-2/3
2/4-2/3
(6-8)/12
-2/12
R= -1/6
3/4-9/16-2/3
= -23/48