<span>(28-х):0,3=5;</span>
<span>28-х=5*0,3</span>
<span>28-х=1,5</span>
<span>х=28-1,5</span>
<span>х=26,5</span>
<span>
</span>
<span><span>4,2х+8,4=14,7;</span></span>
<span><span>4,2х=14,7-8,4</span></span>
<span><span>4,2х=6,3</span></span>
<span><span>х=6,3:4,2</span></span>
<span><span>х=1,5</span></span>
<span><span><span>
</span></span></span>
<span><span><span>
</span></span></span>
<span><span><span>0,39:х-0,1=0,16</span></span></span>
<span><span><span>0,39:х=0,16+0,1</span></span></span>
<span><span><span>0,39:х=0,26</span></span></span>
<span><span><span>х=0,39:0,26</span></span></span>
<span><span><span>х=1,5</span></span></span>
<span><span>
</span></span>