5 of 6 × 4.7 + 5.3 △ 6 of 5 12 minus 3 of 4 × 21 of 20 minus 2 of 7, 1 of 2 + 2 × = 6.5

5 of 6 × 4.7 + 5.3 △ 6 of 5 12 minus 3 of 4 × 21 of 20 minus 2 of 7, 1 of 2 + 2 × = 6.5

5 / 6 × 4.7 + 5.3 △ 6 / 5
=5/6×(4.7+5.3)
=5/6×10
=25/3
12 minus 4:3 × 21:20 minus 7:2
=12-(5/7+2/7)
=12-1
=11
1 / 2 + 2 × = 6.5
2x=6
x=3