Practice problem
Simplify the expression A−B+C−DA-B+C-DA−B+C−D when A=1B=3AC=2BD=A+C\begin{align} A&=1\\ B&=3A\\ C&=2B\\ D&=A+C \end{align}ABCD=1=3A=2B=A+C
333
−3-3−3
666
−6-6−6
Type a concept, like “slope” or “photosynthesis”.
