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Solving Algebraic Equations for a Given Variable

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I need a step-by-step way to complete these problems:

A= P+Prt ; for P

Ax+ By=C; for y

A= P(1+rt); for r

A= 1/2(B+b); for B

D= C-s
----- for C

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Solution Summary

Equations are solved for a given variable. Explanations are provided.

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A= P+Prt ; for P

It is the same as
A = P(1+rt), so dividing both sides by (1+rt), we have P=A/(1+rt)

Ax+ ...

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