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Question
Make A the subject of formula R = `("m"_1"B" + "m"_2"A")/("m"_1 + "m"_2)`
Solution
R = `("m"_1"B" + "m"_2"A")/("m"_1 + "m"_2)`
⇒ R (m1 + m2) = m1B + m2A
⇒R (m1 + m2) - m1B = m2A
⇒ `("R" ("m"_1 + "m"_2) - "m"_1"B")/"m"_2` = A.
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