9х+28=2755
9х=2727
х=2727:9
х=303
<span> 9х+28=2755</span>
<span>9х=2755-28</span>
<span>9х=2727</span>
<span>х=2727:9</span>
<span>х=303</span>
<span></span>
<span>проверка</span>
<span>9*303+28=2755</span>
<span>2727+28=2755</span>
<span>2755=2755</span>