1) 3+2-5+x=2+1-3
5-5+x=3-3
0+x=0
x=0
2)2+6-12=x+16-4
+8-12=x+12
-4=x+12
x=12+4=16
3)2+6-1=x+16-4
+8-1=x+12
7=x+12
x=12-7
x=5
4)-5-6+x=5-8+3
-11+x=+5-5
x=0+11
x=11
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1) 3+2-5+x=2+1-3
5-5+x=3-3
0+x=0
x=0
2)2+6-12=x+16-4
+8-12=x+12
-4=x+12
x=12+4=16
3)2+6-1=x+16-4
+8-1=x+12
7=x+12
x=12-7
x=5
4)-5-6+x=5-8+3
-11+x=+5-5
x=0+11
x=11