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-1[x+1]=4x-21
-x-1=4x-21
-x-4x=-21+1
-5x=-20
x=-20/-5
x=4
1-2[4-3x-4]=4x-20-1
1-8+6x+8=4x-21
6x-4x=-21-1+8-8
2x=-22
x=-22/2
x=-11