1) 5,2x-8=-30+5,09x
5,2x-5,09x=-30+8
0,11x=-22
X=-200
2)20,1x-1,1=40-21x
20,1x+21x=40+1,1
41,1x=41,1
x=1
3)51-66,3x=-7-63,4x
-66,3x+63,4x=-7-51
-2,9x=-58
X=20
