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-x=11 - 10
-x= 1
x= -1
2) x -6 = 9
x = 9 + 6
x = 15
3) 12 + x = 16
x=16-12
x= 4
4) x + 12 = 1
x= 1 - 12
x = 11
5) x-8= 3
x= 3+8
x= 11