2.x= 18 - x=9, 5 x-4= 31 - x=7, x+4= 15 - x=11, 3 x-2= 16 - x= 6, 3 x-5= 16 - x= 7, 3.(x+1)= x +11 - x= 4, (12.x- 8):2 =14 - x= 3,

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