Question

100:(18+(82-10x):6)=5

Answer 1

18+(82-10x):6=100:5,
18+(82-10x):6=20,
(82-10x):6=20-18,
 (82-10x):6=2,
82-10x=2*6,
82-10х=12,
10х=82-12,
10х=70,
х=70:10,
х=7.