r can be written as dx - de
What are equations?
An equation is a mathematical statement which equate two algebraic expressions. An equation has an equal to (=) sign in between the expression.
How to make r the subject of the given equation?
The given equation is x= e + r/d
⇒ r/d = x - e ( changing side)
⇒ r = dx - de ( cross multiplication)
∴ r can be written as dx - de
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