0.3(2x+1)-(0.4+0.2x)+0.9=0
0.6x + 0.3 – 0.4 – 0.2x + 0.9 = 0
0,6x – 0,2x = 0 – 0,9 + 0,4 – 0,3
0.4x = -0.8
x = -2
0.3(2x+1)-(0.4+0.2x)+0.9=0
0.6x + 0.3 – 0.4 – 0.2x + 0.9 = 0
0,6x – 0,2x = 0 – 0,9 + 0,4 – 0,3
0.4x = -0.8
x = -2