-18-[3(x+2)+4]=21-[6(-2x-2)+1]
-18-[3x+6+4]=21-[-12x-12+1]-18-[3x+10]=21-[-12x-11]-18-3x-10=21+12x+11-28-3x=32+12x
-28-32=12x+3x-60=15xx=-60/15x=-4
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-18-[3x+6+4]=21-[-12x-12+1]
-18-[3x+10]=21-[-12x-11]
-18-3x-10=21+12x+11
-28-3x=32+12x
-28-32=12x+3x
-60=15x
x=-60/15
x=-4