X-2=0 x =0+2 x =2 x +4=0 x =0-4 x =-4 100+ x =0 x =0-100 x =-100 x-5=6 x =6+5 x =11 x +2=5 x =5-2 x =3 x-11=-7 x =-7+11 x =4 12+ x =17 x =17-12 x =5 x +7=7 x =7-7 x =0

157

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