<span>3x-6=0</span>
3х=6
х=2
<span>7*(e+8)=84 </span>
<span>7е+56=84</span>
<span>7е=28</span>
е=4
<span>у*(2-у)=0</span>
<span>2у-у^2=0</span>
<span>у(2-у)=0</span>
<span>у=0 или у=2</span>
<span><span> 4к+9=4к-9 </span></span>
<span><span>0=-18</span></span>
<span><span><span> 8а -45=5а+30</span></span></span>
<span><span><span>3а=75</span></span></span>
<span><span><span>а=25</span></span></span>