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a) 0,2x + 0,3 = - 0,5 /*10
2x+3=-5
2x=-5-3
2x=-8
x=-4
b)0,4+0,25x = - 2
0,25x=-2-0,4
0,25x=-2,4 /*4
x=-9,6
c)2,1-0,3x=0,4x /*10
21-3x=4x
-3x-4x=-21
-7x=-21
x=3
d)- 1,5x - 3 = 0,2x +6 /*10
-15x-30=2x+60
-15x-2x=90
-17x=90
x= -90/17=-5i 5/17