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16x-[3x-6+9x]=30x+[-(3x+2-x-3)]
16x-[12x-6]=30x+[-(2x-1)]
16x-12x+6=30x+[-2x+1]
4x+6=30-2x+1
4x+6=31-2x
4x-2x=31-6
2x=25
x=25/2=12,5
Espero que te ayude