Question 207280
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3{[5(n-4)+16]-[2(5n-3)+1]}

3{[5n-20+16]-[2(5n-3)+1]}

3{[5n-4]-[2(5n-3)+1]}

3{[5n-4]-[10n-6+1]}

3{[5n-4]-[10n-5]}

3{5n-4-[10n-5]}

3{5n-4-10n+5}

3{-5n+1}

-15n+3

Edwin</pre>