= 19
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3 + 8 =11 + 9 = 20 - 5 = 15 - 1 = 14 + 6 = 20
\(3+8+9-5-1+6\)
\(=\left(3+8\right)+9-5-1+6\)
\(=11+9-5-1+6\)
\(=\left(11+9\right)-\left(5+1\right)+6\)
\(=20-6+6\)
\(=20-0\)
\(=20\)
3 + 8 + 9 - 5 - 1 + 6
= 11 + 9 - 5 - 1 + 6
= 20 - 5 - 1 + 6
= 15 - 1 + 6
= 14 + 6
= 20