Example

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

Question

$$(+10)+(+20)+23+(-32)+42$$

Answer

63

Solution


Simplify  \(+10\)  to  \(10\).
\[10+20+23-32+42\]
Simplify  \(10+20\)  to  \(30\).
\[30+23-32+42\]
Simplify  \(30+23\)  to  \(53\).
\[53-32+42\]
Simplify  \(53-32\)  to  \(21\).
\[21+42\]
Simplify.
\[63\]
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