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X = (m1*x1 + m2*x2) / (m1 + m2)
X = (x1 + x2) / 2
X = (m1 + m2) / (x1 + x2)
X = (m1^2*x1 + m2^2*x2) / (m1^2 + m2^2)
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Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.