Question

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

Answer 1

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

Answer 2

18+(82-10х):6=5*100;
(82-10х):6=500-18;
82-10х=482*6;
-10х=2892-82;
-10х=2810;
-х=2810/10;
Х=-281