1.(х-18,2) +0, 39=4, 7
(х-18 ,2) =0, 39-4, 7
(х-18,2) =4, 31
х=18,2+4, 31
х=22, 51
2. 74,6-(t-0, 34) =31
( t-0, 34) =74, 6+31
(t-0, 34)=105, 6
t=105, 6-0, 34
t =105, 26
