<span> 1.6*(x+0.2)=4.48</span>
<span>1,6х+0,32=4,48</span>
<span>1,6х=4,48-0,32</span>
<span>1,6х=4,16</span>
<span>х=4,16:1,6</span>
<span>х=2,6</span>
<span> <span>5.78(x-0.3)=3.4 </span></span>
<span><span>5,78х-1,734=3,4</span></span>
<span><span>5,78х=3,4+1,734</span></span>
<span><span>5,78х=5,134</span></span>
<span><span>х=5,134:5,78</span></span>
<span><span>х=0,88</span></span>
(5.16-x):2.9=1.4
5,16-х=1,4*2,9
5,16-х=4,06
х=5,16-4,06
х=1,1