52 cards in a deck
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52 pt * (2 c / 1 pt) = 104 c
The answer might depend on what c and d are supposed to be!
c = 6 and d = 7
13+c = -39 c = -39-13 c = -52
If a=b and c=d then (a+c)=(b+d) ? This is proved very simply by the direct application of perhaps the most fundamental statement in all of Algebra: "If equals are added to equals, the sums are equal."