<span>(1,65-0,3x):0,34=4,5</span>
<span>1,65-0,3x=4,5*0,34</span>
<span>1,65-0,3x=1,53</span>
<span>0,3x=1,65-1,53</span>
<span>0,3x=0,12</span>
<span>x=0,12:0,3</span>
<span>x=0,4</span>