(1)0.2x-0.3x-0.4x=0.5
(0.2-0.3-0.4)x=0.5
-0.5x=0.5
x= -1
(2)4x-1.5x+2.5x=-15
(4-1.5+2.5)x= -15
5x = -15
x= -3