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b) 3+24x*4+8=3+96x+8=11+96x
c) 2x*4:2=8x:2
d) 6x*20:(-3)=120x:(-3)
3+4x(6-2)+8=6x4+8=32
2x(5-1):(4-2)=8/2=4
6x(7+13):(39-42)=120/-3=-40