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[2-1•2]: 1- 1= x/1+ 1- 3
0: 1- 1 -1+3= x/1
0-2+3=x/1
1=x/1
X=1•1
X=1
____________
[2-(3-7/2)°2]÷(2/7)°-1 = x/1+2°-3
[2-1•2]:1 -1= 1/1 +1 -3
0:1- 1= 1+1- 3
0-1= 2-3
-1=-1.