-3.5
Объяснение:
0.4x+3=0.6x+0.2-x
0.4x+3-0.6x+x=0.2
0.4x-0.6x+x=0.2-3
-0.2x+x=-2.8
0.8x=-2.8
x=-2.8/0.8
x=-3.5
-3.5
Объяснение:
0.4x+3=0.6x+0.2-x
0.4x+3-0.6x+x=0.2
0.4x-0.6x+x=0.2-3
-0.2x+x=-2.8
0.8x=-2.8
x=-2.8/0.8
x=-3.5