21 : (3 - 7) + 4 × (-2)=

21 : (3 - 7) + 4 × (-2)
☞ selesaikan yg didalam tanda kurung terlebih dahulu

= 21 : (-4) + 4 x (-2)
= (21 : -4) + (4 x -2)
= -5,3 + -8
= -13,3

=
21: -4+ -8=
-5,25+ -8=
13,25