B = ( + 12 ) - ( + 8 )+ ( - 4 ) - ( - 3 ) +( + 4 )
B = 12-8 -4 +3 +4
B = 7
C =( - 54 ) : (+ 9 ) x (- 3 )
C = - 54 : 9 x ( - 3 )
C = -6 x - 3
C = 18
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B = ( + 12 ) - ( + 8 )+ ( - 4 ) - ( - 3 ) +( + 4 )
B = 12-8 -4 +3 +4
B = 7
C =( - 54 ) : (+ 9 ) x (- 3 )
C = - 54 : 9 x ( - 3 )
C = -6 x - 3
C = 18