Example

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

Question

$$1+2-1+3-1+4$$

Answer

8

Solution


Simplify  \(1+2\)  to  \(3\).
\[3-1+3-1+4\]
Simplify  \(3-1\)  to  \(2\).
\[2+3-1+4\]
Simplify  \(2+3\)  to  \(5\).
\[5-1+4\]
Simplify  \(5-1\)  to  \(4\).
\[4+4\]
Simplify.
\[8\]
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