a) 5. x -392 = 218
5.x =218+392
5.x = 610
x = 610 : 5
x= 122
b) [ ( 6 . x - 39 ) : 7] .4 = 12
(6.x-39 ) : 7 = 3
6.x-39= 21
6.x =21+39=60
x=10
c) 3672 : [ 119 - ( x - 6) ] =36
119-(x-6)= 3672:36=12
x-6 = 119- 12
x-6= 107
x= 107 + 6= 113
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