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x-9=-1
x=-1+9
x=8
2)
-2+x=4
x=4+2
x=6
3)
2+x=-1
x=-1-2
x=-3
x=-1+9
x=8
-2+x=4 /+2
x=4+2
x=6
2+x=-1 /-2
x=-1-2
x=-3