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2) 6x-12+4x-1=-x-7x+12-3x+5
3) 2x-(x+5)=6+(x+1)
4) 8-(3x+3)=x-(2x+1)
5) 4x-2=7x-(x+3)+(-x-6)
6) 2x+[2x-(x-4)]=-[x-(5-x)]
7) x-{5+3x-[5x-(6+x)]}=-3
8) -{7x+[-4x+(-2+4x)]-(5x+1)}=0
9) -{-[-(-6x+5)]}=-(x+5)
10) -{4x-[-2x-(3x+6)]}=4-{-x+(2x-1)}