Question

0,3(5-х)+1,3=0,4(3х-8)

Answer 1

1,5 - 0,3X + 1,3 = 1,2X - 3,2 
1,2X + 0,3X = 2,8 + 3,2 
1,5X = 6 
X = 4

Answer 2

0.3(5-x)+1,3=0,4(3x-8)
1.5-0.3x+1.3=1.2x-2.4  |*10
15+13-3x=12x-32
28+32=12x+3x
15x=60
x=4