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[ 4÷ (4-6)/5 ]^-1- [ -2/10) + ((2-1)/2)² ] ÷ 1/10
[ 4÷ (-2/5) ]^-1- [ -(2/10) + 1/4 ] ÷ 1/10
[-20/2]^-1 - [1/20] ÷ 1/10
-2/20 - 1/20 ÷1/10
-2/20 - 10/20 = (-2-10)/20 =-12/20 = -3/5