а)<span>8-5х+х=164</span>
<span> -4х=20,5</span>
<span> х=-5,125</span>
<span>б)<span>8х-5,5-х=-18,8</span></span>
<span><span> 7х=-13,3</span></span>
<span><span> х=-1,9</span></span>
<span><span>в)<span>12х-5,9-7,5х+3,2=-4,05</span></span></span>
<span><span><span> 4,5х=-1,35</span></span></span>
<span><span><span> х=-0,3</span></span></span>
<span><span><span>г)</span></span></span>9,1х+2-х-6=-52,6
8,1х=-48,6
х=-6
<span>
</span>