Question

-2+{-1+[5-3.(10+1):]-5-7}

Answer 1

-2+{-1+[5-3.(10+1):3]-5.7}

-2+{-1+[5-3.11:3]-5.7}

-2+{-1+[2.11:3]-5.7}

-2+{-1+[22:3]-5.7}

-2+{-1+7,3-5.7}

-2+{8,3-5.7}

-2+{3,3.7}

-2+23,1=

21,1