Наверное так........./.........
<span>(8y</span>²<span>+4y)(5y</span>³<span>+2y</span>²<span>+7y</span>⁴<span>) =
= 40у</span>⁵+20у⁴+16у⁴+8у³+56у⁶+28у⁵ =
= 56у⁶+68у⁵+36у⁴+8у³
6(2-у)=27
<span>2-у=27/6 </span>
<span>2-у=4,5 </span>
<span>у=2-4,5 </span>
<span>у=-2,5</span>