12
-9 + x = 3
-9 + x + 9 = 3 + 9
x = 3 + 9
x = 12
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9. -6+6=0 0+3=3 therefore -6+9=3
you need to add +9 +9-7 = +2
Add -3 to 9 because 9+(-3) = 6 Alternatively add s to the Roman numeral of ix which is 9 which then becomes six.
-9 + 11 = 2
- 8 + 17 = 9 =========