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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If A + B = C, B - A = D, and D * 2 = E, what is the value of E if A = 3 and B = 7?

Answer: B. 10
Substituting A and B: C = 3 + 7 = 10; D = 7 - 3 = 4; E = 4 * 2 = 8.
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