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-2x= 8-4
-2x= 4
x= 4/-2
x= -2
10=2x+6
2x +6 = 10
2x= 10 -6
2x= 4
x= 4/2
x= 2
2-9x= -16
-9x= -16 -2
-9x = -18
x= -18/-9
x= 2