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=4+[5x(-6)]-(-7)
=4+(-30)-(-7)
=4+(-30)+7
=4-30+7
=-19
2.8-4:(-2)+6
=8-[4:(-2)]+6
=8-(-2)+6
=8+2+6
=16
3.21:(-7)+(-5)
=[21:(-7)]+(-5)
=-3+(-5)
=-3-5
=-8
4.(-10)-(-6)x3
=(-10)-[(-6)x3]
=(-10)-(-18)
=(-10)+18
=8
setahu saya gitu cara ngitungnya,itu dari guru saya,maaf kalo salah,semoga membantu:)