Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$f=U \pm D$$

Answer

U=f+D

Solution


Simplify  \(U+-D\)  to  \(U-D\).
\[f=U-D\]
Add \(D\) to both sides.
\[f+D=U\]
Switch sides.
\[U=f+D\]
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