Example

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

Question

$$(19+3-7)-(3+9-10)-3=$$

Answer

10

Solution


Simplify  \(19+3\)  to  \(22\).
\[22-7-(3+9-10)-3\]
Simplify  \(3+9\)  to  \(12\).
\[22-7-(12-10)-3\]
Simplify  \(12-10\)  to  \(2\).
\[22-7-2-3\]
Simplify  \(22-7\)  to  \(15\).
\[15-2-3\]
Simplify  \(15-2\)  to  \(13\).
\[13-3\]
Simplify.
\[10\]
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