12+ [(42÷6)-10]x(-7)=

12 + [( 42 ÷ 6 ) - 10] × ( -7 )
12 + [(7) -10] × (-7)
12 + (-3 × (-7))
12 + 21 = 33

12 + [(42:6)-10] x (-7)
=(7-10) x (-7)
=(-3) x (-7)
=21
=12 + 21
=33
maaf kalau salah dan semoga membantu