(-6)÷(-2)-(-3)=
(-1)+(-3)-(+4)÷(-2)=
(+20)÷(-4)+(+5)•(-2)=
(+8)-(+8)÷(+4)•(+4)=
(+18)-(+4)•[(-7)÷(+1) +6=
(+16)+0÷(-2)-(+1)•(-9)=
​