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Problem-Solving By Substitution
Interchange Of Signs And Numbers

If M + N = O, N * 2 = P, and P - O = Q, what is the value of Q if M = 4 and N = 6?

Answer: A. -2
Substituting M and N: O = 4 + 6 = 10; P = 6 * 2 = 12; Q = 12 - 10 = 2.
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