18•(0,3х11.6)=345,42

18*(0,3х11,6)=345,42
(0,3х11,6)=345,42:18
0,3х11,6=19,19
3,48х=19,19
х=19,19:3,48
х=5,514
18*(0,3*5,514*11,6)=345,42
18*19,19=345,4
345,4=345,4