3*0+3*7-{4+[3*5*(2*4-3x)+1*13:8}=6

Răspuns :

0+21-4+15*8-15*3x+13/8=6
21+4+120-45x+13/8=6
145-45x+13/8=6
145+13/8-6=45x
139+13/8=45x|*8
1112+13=360x
1125=360x|:360
x=3.125