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( 3+ 1/4)-(2+1/6)
1/2:(1/4+1/3)
(5/3-1).(7/2-1)
(3/4+1/2):(5/3+1/6)
24x-71 4x+24
-2x+8 3x-12
-24+6x 10x+30
21x-28