Question

{[(3×n+5)×3+5]×3+5}×3+5=281​

Answer 1

{[(3×n+5)×3+5]×3+5}×3+5=281/-5

{[(3×n+5)×3+5]×3+5}×3=276/÷3

[(3×n+5)×3+5]×3+5=92/-5

[(3×n+5)×3+5]×3=87/÷3

(3×n+5)×3+5=29/-5

(3×n+5)×3=24/÷3

3×n+5=8/-5

3×n=3

n=3÷3

n=1