it means one side of the shape is 18 and the other side is 12
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If you mean 4-x = 18 then the value of x is -12 because 4--12 = 18
If you mean -x +x/3 = 12 then the value of x is -18 Check: --18 +(-18/3) = 12
2+5+9+12+18+18+20=8484 divided by 7 (the amount of numbers you added) equals 12so your answer is 12.
You need to be careful in how you write such questions as it is important to know if you mean: x - 12/2 = 18 or (x-12)/2 = 18 If x - 12/2 = 18 then x = 18 + 12/2 x = 18 + 6 x = 24 If (x-12)/2 = 18 then x - 12 = 18 * 2 x - 12 = 36 x = 36 + 12 x = 48