1. 30-23,1:(107/20 - 146/35) = 30-23,1:(165/140) = 30-98/5 = 30-19,6 = 10,4
1) (x-67,15)-(21,3-7,009)=0,51
x-67,15-14,291=0,51
x-81,441=0,51
x=0,51+81,441
x=81,951
2)(7,05+0,0009)-(20,16-y)=0,203
7,0509-(20,16-y)=0,203
-13,1091+y=0,203
y=0,203-(-13,1091)
y=13,3121