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13-3[3x+6+4]=11-[-12x-12+1]
13-9x-18-12=11+12x+12-1
-9x-12x=11+12-1+18-13
-21x=27
x=27/-21
x= -9/7
13-3[3x+6+4]=11-[-12x-12+1]
13-3[3x+10]=11-[-12x-11]
13-9x-30=11+12x+11
-9x-17=22+12x
-17-22=12x+9x
-39=21x
-39/21 =x
-13/7=x
13-3-[3(x+2)+4]=11-[6(-2x-2)+1]
13-3-[3x+6+4]=11-[-12x-12+1]
13-3-[3x+10]=11-[-12x-11]
13-3-3x-10=11+12x+11
0-3x=22+12X
-22=12X+3X
-22=15X
-22/15=X