[( x : 7 +108 ) :4 x 10 -192] : 4=87
( x :7+180) : 4 x 10 -192 =87 x 4
(x ; 7 +108) ;4 x 10-192=348
(x :7 +108 ) :4 x 10=348+192
(x : 7+108) :4 x 10=540
(x:7+108) :4=540: 10
(x :7 +108) :4=54
x:7+108=54x4
x :7+108=216
x ;7 =216-108
x:7=108
x=108 x 7
x=756