0.2(4k+3)+0.8(5k+4)=1.4(4k-3)
0.8k + 0.6 + 4k + 3.2 = 5.6k – 4.2
0,8k + 4k – 5,6k = – 4,2 – 3,2 – 0,6
-0.8k = -8
k = 10
0.2(4k+3)+0.8(5k+4)=1.4(4k-3)
0.8k + 0.6 + 4k + 3.2 = 5.6k – 4.2
0,8k + 4k – 5,6k = – 4,2 – 3,2 – 0,6
-0.8k = -8
k = 10