Question

41-5×{[6-3×(a-48:4):9×4-45:9-35:5}=1

Answer 1

41 - 5 * {[6 - 3 * (a - 12) : 9] * 4 - 5  - 5} = 1
5 * {[6 - 3 * (a - 12) : 9] * 4 - 10} = 1 + 41
{[6 - 3 * (a - 12) : 9] * 4 - 10} = 42 * 5
[6 - 3 * (a - 12) : 9] * 4 = 210 + 10
[6 - 3 * (a - 12) : 9] = 220 : 4
6 - 3 * (a - 12) : 9 = 55 
3 * (a - 12) : 9 = 55 + 6
(a - 12) : 9 = 61 * 3
a - 12 = 183 * 9
a = 1647 + 12
a = 1659

Answer 2

41-5×{[6-3×(a-12):9]×4-5-7}=1
41-5×[(6-3a+36:9)×4-5-7]=1
41-5×[(6-3a+4)×4-5-7]=1
41-5×(24-12a+15-5-7)=1
41-5×(26-12a)=1
41-130+60a=1
-89+60a=1
60a=90
a=90/60