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Anonymous
-7 + 11 = +4
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The answer is 21 because if 21 is divided by 3 it equals 7 plus 4 equals 11.
11-4+7 = 14
-7 = (-11 +x ) -7 -x = -11 x= 4
x-7+7=11+7 x=11+7 x=18