that's stupid
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The solution (not sum) to the equation 21 = 3c + 6 is as follows:21 = 3c + 621 - 6 = 3c + 6 - 615 = 3c3c = 153c/3 = 21/3c = 7
29.
x+ y = 8 is one equation; x - y = 6 is another equation add equations and 2x = 14 x = 7 y = 1
6 + 7 = 13(Sum means add)
19