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Anonymous
Well since an equation has an equal sign it is 6+7=13
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4
13
The expression (not equation) is 6 + 7
20
the sum of -2 and 6 and 7 is (-2+6+7)
in the equation 3+4=7, 3 and 4 are the addends. 7 is the sum.
-6 + 7 - 4 = -3